Alternative title: A ton of first graders get this problem wrong I- I should probably clarify this since this comment is STILL getting replies and discourse: this comment is a JOKE!!
um...i'm an indian, and if i get this question wrong in my exams, my teacher will personally give me an hour-long lecture about taking arts after 10th grade :)
@@carultch In general, especially on such tests like the SAT, yes. But then you get into more advanced math and you learn you can't trust the diagram unless it is specifically indicated so or can be derived from the information given.
It confused the shit out of me, too, because I'm looking at x to the zero power which, of course, would be 1. I've taken a lot of upper level math and have never seen anything like this.
Units of measurement aren’t even used when you don’t know the value of the quantity you are measuring: nobody says a = x m/s^2. And to top it all off, he doesn’t use them for the answers themselves where a value is actually given (“90 what? Peanuts?” As my teacher used to say)
This is a standard multiple choice mistake, though it is slightly twisted. Frequently, a MCQ will have you solve for x, (say x = 18), then plug x back into an angle for the final answer (say 36 degrees). But because one of the multiple choice answers is 18, the immediately pick that answer as soon as they find something that applies, without considering what the question is actually asking for.
If you are smart enough to know it, just skip the video. Don't leave a comment making people feel bad about themselves. The video probably helped someone, that is what matters
No one said anything relating to this helping, no one felt bad about themselves, you're creating problems where they don't exist and advocate against them
IDK if this is a thing but you are not told if the line on the bottom is a straight line and you can't just assume it is because it looks like one hence the question isn't solvable without that information. In my experience, you should never take anything for granted in geometry as it is really hard to eyeball stuff like that.
@@sriram7904well in us most do calculus the year they take this exam the sat is supposed to be at an easy math level and is supposed to be possible for people to who don’t really know math past geometry so the question are not hard but sometimes confusing
Lmao i thought i knew it immediately then he said "a ton of people get this one wrong", so i second guessed myself. But nope, its as obvious as it seems!
It’s a standardized exam used to test your comprehension on maths, reading, and language. It’s not very comprehensive and more general, however, having a higher score on it can help you get into better colleges, and get you scholarships.
@charcoalblasterdogalt3057 You know it is a right angle because of the right angle symbol. A right angle is 90 degrees. You can tell that there are five X angles that make up 90 degrees. That is like saying x= 90÷5 90÷5=18 so x=18 The question asks for the value of 5x That means 5 times x which = 90. It's a trick like he says, because people solve for x itself and feel like they solved it. My brain said 18 right away, but then I checked three actual question one more time (like I would of this were a final exam) and thought "Ah!! They almost caught me!"
Alternatively you are assuming that it is in fact a straight line of 180 degrees. How do we know it is not 181 or 179? The only info actually given is the right angle
Since it was shown one angle was 90 degrees and the other one lies on the same line it makes a supplementary angle, meaning that both angles equals to 180 degrees, and 90 is the only other angle you can have to add up to 180 degrees.
@@ryanandrcdiaz6436 Incorrect, you cannot tell from the diagram that it is "the same line". That is an assumption you are incorrectly making. You would need an angle symbol indicating it was 180 degrees, or some symbol that indicates the internal angles add up to 90.
For anyone confused, people probably get it wrong because in this type of questions, everyone simply finds th value of x which is 18 and thinks it's the answer, people don't read carefully to know it was 5x.
They probably get it wrong because it’s not written correctly. It’s not clear that you’re solving for an angle. As written, you’re solving for the length of the line. If you’re solving for the angle, the problem, the diagram, and the answers given need the correct markings.
I agree that ALL math problems should be presented accurately BUT you gotta be a total d*****ss to mistake this for anything other than an angle problem. Thats not the issue here.
I agree, with the symbol of degrees looking like an exponent, no mark to show that 2x is for the angles and x for the first one Math is rigorous and need precision, you can’t ask for a good and precise answer if the question is not The mistakes the teacher makes will be visible in the way the students will approach the field
Dawg u are not just wasting your time but ours too, everyone with a functional brain and above the 6th grade can solve this without you explaining it to them.
@@thatoneguy611 correct, but irrelevant. raising x to the 0 power makes it always EQUAL 1, but that doesnt mean x=1 if x=5, then 5x^0=5, but 5x=25, not 5
Including the degree symbol can be misleading because it could be interpreted as a zero exponent. The problem would be better understood if the angle was not labeled degrees and to state that they are in terms of degrees using a sentence.
You're just assuming that that is a straight line and not 179⁰/181⁰.... it's only marked as 90⁰ on one side, and we know nothing about the angles on the other side. We only have enough information to solve the problem IF we ASSUME that all 3 of the missing angles add together to 90⁰
I love that I pause these videos to work it out myself and my brain just gives my the answer I wish and then I let him tell me the working. Keeps my brain sharp
The sum of 1 + 5 is a basic arithmetic operation that can be solved using addition. The result of this operation is 6. To solve this problem, we can simply add the two numbers together as follows: 1 + 5 = 6 This is a simple and straightforward calculation that does not require any advanced mathematical techniques or concepts. However, if we want to be more "genius" about it, we can think of this problem in a more abstract way. For example, we can think of 1 + 5 as a problem of combining sets. We can represent the number 1 as a set with one element, and the number 5 as a set with five elements. Then, we can combine these two sets to get a new set with six elements. Alternatively, we can think of 1 + 5 as a problem of counting. We can start at 1 and count up by fives until we reach 6. These more abstract ways of thinking about the problem can help us to develop a deeper understanding of the concepts of addition and number. However, they do not change the fact that the sum of 1 + 5 is 6. In summary, the sum of 1 + 5 is 6. We can calculate this using basic addition, or we can think of the problem in a more abstract way using sets or counting. These more abstract ways of thinking can help us to develop a deeper understanding of the concepts of addition and number.
I think ppl got it wrong because they don't read the question. Common mistake probably ppl choose 18. Because usually they would ask the value of X and not 5X or 4X etc.
Just saying, this reasoning might work for a middle school math problem, but having the 90 deg indicator on one side of that segment doesnt mean that the other side is also 90 degrees. You would meed to show that the bottom line is in fact one line using arrows on the ends.
@@idonated50jellybeanstothew56 thats the thing though, just because it looks 90 doesnt mean it is. In the world of machining and engineering you dont get to make assumptions like that.
Ans) Option C )90 From the figure we have , x degree + 2*x degree + 2 x degree = 90 degree 5*x degree = 90 degree 5*x*π/180 = π/2 5*x = 90 Thus, Ans is 90
It's a standard expectation in geometry problems, that if a line appears to be straight, you're meant to assume it is straight. Unless it is otherwise specified.
What is the value of \(5x\)? 1. The diagram shows three angles: \( x^\circ \), \( 2x^\circ \), and \( 2x^\circ \). 2. These angles together form a right angle, which is \( 90^\circ \). 3. Therefore, we can write the equation: \[ x + 2x + 2x = 90^\circ \] 4. Combine the terms: \[ 5x = 90^\circ \] 5. Solve for \( x \): \[ x = \frac{90^\circ}{5} = 18^\circ \] 6. Find the value of \(5x\): \[ 5x = 5 \times 18^\circ = 90^\circ \] So, the correct answer is C) 90.
A ton of people= 1000 kg of people = about 12 people, so this actually makes sense
Underrated comment
Here before blowup
Or 8 Americans
@@mavx4hey! It's 7 for your information
This is a brilliant comment.
Alternative title: A ton of first graders get this problem wrong
I- I should probably clarify this since this comment is STILL getting replies and discourse: this comment is a JOKE!!
Nope, not even first graders can get this wrong.
Man why do I feel dumb In set 1 yr11
No I’m pretty sure the reason people get it wrong is because they don’t focus on the question and instead of finding 5x, they simplify to find x.
Alternative title: a ton of newborns get this wrong
Actually
“If you add them up you get 90 degrees”
*Proceeds to do unnecessary math*
“The answer is 90 degrees”
WHAT IS THIS MAN geography...?, the working out man its crucial
um...i'm an indian, and if i get this question wrong in my exams, my teacher will personally give me an hour-long lecture about taking arts after 10th grade :)
So true 💯
The reason people get it wrong (based on my guess) is that they solve for x and get 18, instead of just getting 90 = 5x.
So what is the value of x?
@@jethrohassem5547 18
You can just get x then multiply with 5 but ig that's extra work
Basically it's, "You've been teaching me to solve for x for the last 3 months. WTF is this on the test?"
@@jayhom5385 so people learn UNDERSTAND the problem, not just know how to do math
You gotta be kidding me with these questions !!!!!!!! Wtf dude !
People won't get it cuz the question says u need to find 5x, but many people solve for x itself :), thus getting it wrong
@@rushilg5679 ah ok, thanks
I know right?? I would've never solved it.
@@rushilg5679 that's sooo tricky 💀
@@rushilg5679 Damn my High school exam has more difficulty than this
You are assuming the bottom line is straight and thus the other side is 90°, but that is unjustified.
If one side is 90, the other side must be 90 for the angles to add to 180, which you know they do because one of the angles is 90
@@sanaiqbal567 That assumes the bottom line is straight.
@@dhwyll we're not really given the option to assume otherwise
@@dhwyll Lines that APPEAR straight in a geometry problem, are considered to be straight. Unless it is otherwise specified.
@@carultch In general, especially on such tests like the SAT, yes.
But then you get into more advanced math and you learn you can't trust the diagram unless it is specifically indicated so or can be derived from the information given.
If it ain't straight it ain't a line.
I thought it was 2x^0 and not the degrees symbol, I was soooo confused😂😂😂
It confused the shit out of me, too, because I'm looking at x to the zero power which, of course, would be 1. I've taken a lot of upper level math and have never seen anything like this.
@@doctormiller50 yeah
Same😂😂 I was like huh, I guess 90 degrees is 5 now😅😅
Yeah I mean I never seen anyone mark angles with x instead of alpha or beta etc bro did us dirty
Units of measurement aren’t even used when you don’t know the value of the quantity you are measuring: nobody says a = x m/s^2. And to top it all off, he doesn’t use them for the answers themselves where a value is actually given (“90 what? Peanuts?” As my teacher used to say)
Legends chose option D.
Lol
😂😂😂
😂
Ya😂
GREAT ENDING: u got it correct!
I would be lucky to find these most easy maths problems in my 10th boards 😂
This is a standard multiple choice mistake, though it is slightly twisted. Frequently, a MCQ will have you solve for x, (say x = 18), then plug x back into an angle for the final answer (say 36 degrees). But because one of the multiple choice answers is 18, the immediately pick that answer as soon as they find something that applies, without considering what the question is actually asking for.
If you are smart enough to know it, just skip the video. Don't leave a comment making people feel bad about themselves. The video probably helped someone, that is what matters
I love your take
Underrated comment
Nah this problem is super easy
@@kingo8914 did someone even ask?
No one said anything relating to this helping, no one felt bad about themselves, you're creating problems where they don't exist and advocate against them
Of course they get it wrong!
What kind of person wouldn't answer D?
Teacher! What do you do if there's two correct answers?
No math during summer 😂😂
IDK if this is a thing but you are not told if the line on the bottom is a straight line and you can't just assume it is because it looks like one hence the question isn't solvable without that information. In my experience, you should never take anything for granted in geometry as it is really hard to eyeball stuff like that.
Its definitely a thing. Youre 100% right, you cant solve this problem with the info provided in the diagram
Bruh it takes 0.01 seconds to get this right😂
You have to explain it why it's 90°
@@0VERALLs no you don't 😂😂
@@lembooleenpaasauskeisari haha yeah, imagine u have
@@0VERALLs bruh it's a multiple choice question you just have to circle one answer...
@@lembooleenpaasauskeisari but some question maybe not
Broo 😂 this is such an easy question ngl
This is education in America 🤣🤣🤣
Sed laip
Very easy linear pair form hoga
I thought the question was hard because I didn't think the answer could be that simple.
@@sriram7904well in us most do calculus the year they take this exam the sat is supposed to be at an easy math level and is supposed to be possible for people to who don’t really know math past geometry so the question are not hard but sometimes confusing
This man doing his surveys in primary school special rooms
For this to be true we have to assume that the bottom is a straight line.
Isn’t this easy????
At first i was about to divide by 5 and get the value of x cuz i barely read questions lmao
It's late at night for me, but I could of solved it if I wasn't half asleep. I thought it said x^0 or x⁰. Same with the other numbers
Bruh it’s ez
Wat u talking I watched this when I was abt to sleep it is still easy
@@grandxeno7288 instead of a degrees sign, my stupid ass thought it was to the power of 0, because I was half asleep. The actual math is easy
Got 90 but I was really skeptical that it was something else from the title😂
90 is wrong. You cant assume the angles add up to 90 just because the left angle is 90
@@charcoalblasterdogalt3057 you can lol, it's called supplementary angles
I wish maths was this easy in India
same
This man just made math easy.
Lmao i thought i knew it immediately then he said "a ton of people get this one wrong", so i second guessed myself. But nope, its as obvious as it seems!
Fr
Yeah, it’s undefinable, nothing proves the line equals 180°, he just assumed it does cause theres a 90° angle.
Can i ask what is this exam SAT i feel like the easiest exam i have ever discovered on internet
It’s a standardized exam used to test your comprehension on maths, reading, and language. It’s not very comprehensive and more general, however, having a higher score on it can help you get into better colleges, and get you scholarships.
@@sharad6697 Now i understand how we Indians have made Americans our slave
It doesn’t actually notate that the line is straight
“And just like, that I’m a genius” that’s what I heard 😭😂 Cool though! I didn’t know the answer…….😅
Not me thinking it said x to the 0 power 💀
Same
Who tf is gonna get this wrong 💀💀💀💀
Me 100%
Mostly people who find value of x
Uhh Americans?
Misreaders
@@eg8049 Xenophobe
I love your channel. You remind me old math questions:) thank you
I didn't read the question and assumed I was solving for x. I finished uni level maths lmao.
Broo I would have made the mistake of saying a cuz I automatically thoight whats the value of x lol
And here I thought, well it'll obviously be 18, surely, right? Who would not ask for X's value... Yep, that's how I got it wrong ;-;
Title should be ‘I find maths extremely difficult so talk through a primary school problem to pretend I’m smart’
If adults are getting this wrong, our society is in danger.....
You cannot solve for x with the info given.
@@charcoalblasterdogalt3057what do you mean
I can't fathom how any adult, without some kind of affliction, could get this wrong.
How do you know the 3 angles on the right add up to 90 degrees? If you dont have any affliction, that is
@charcoalblasterdogalt3057
You know it is a right angle because of the right angle symbol.
A right angle is 90 degrees.
You can tell that there are five X angles that make up 90 degrees.
That is like saying x= 90÷5
90÷5=18 so x=18
The question asks for the value of 5x
That means 5 times x which = 90.
It's a trick like he says, because people solve for x itself and feel like they solved it.
My brain said 18 right away, but then I checked three actual question one more time (like I would of this were a final exam) and thought "Ah!! They almost caught me!"
Alternatively you are assuming that it is in fact a straight line of 180 degrees. How do we know it is not 181 or 179? The only info actually given is the right angle
The only correct answer here
Since it was shown one angle was 90 degrees and the other one lies on the same line it makes a supplementary angle, meaning that both angles equals to 180 degrees, and 90 is the only other angle you can have to add up to 180 degrees.
@@ryanandrcdiaz6436 it never says it is a line was my point. You have to assume it
@@ryanandrcdiaz6436 Incorrect, you cannot tell from the diagram that it is "the same line". That is an assumption you are incorrectly making.
You would need an angle symbol indicating it was 180 degrees, or some symbol that indicates the internal angles add up to 90.
For a second I thought that all of these angles were to the power of 0
For anyone confused, people probably get it wrong because in this type of questions, everyone simply finds th value of x which is 18 and thinks it's the answer, people don't read carefully to know it was 5x.
I don't care the most math I need at my workplace is calculating the length and width of a wooden board
Yes but this is not for specific profession, it's a math test.
Don’t watch then?
When did I write this
They probably get it wrong because it’s not written correctly. It’s not clear that you’re solving for an angle. As written, you’re solving for the length of the line. If you’re solving for the angle, the problem, the diagram, and the answers given need the correct markings.
I agree that ALL math problems should be presented accurately BUT you gotta be a total d*****ss to mistake this for anything other than an angle problem. Thats not the issue here.
I agree, with the symbol of degrees looking like an exponent, no mark to show that 2x is for the angles and x for the first one
Math is rigorous and need precision, you can’t ask for a good and precise answer if the question is not
The mistakes the teacher makes will be visible in the way the students will approach the field
Also, the 0 superscript that’s supposed to probably mean x degrees looks like x to the power of 0 which would make the answer 5
I scoffed at this and said “it’s clearly 18.” I am the ton of people :(
Looks like "A ton of people" failed primary school maths...
So did you if you think the answer is 90.
Dawg u are not just wasting your time but ours too, everyone with a functional brain and above the 6th grade can solve this without you explaining it to them.
Don't be rude. He's just trying to help.
@@spider-bromance spider bro ; 😂- nice name 💀
@@PodcastXx thank you
@@spider-bromance I was being sarcastic but I mean ignorance is bliss 🤙
@@PodcastXx oh realllllly... I couldn't tell
Never let them know your next move.
The degrees symbols are actually exponents to the power of zero, so 5x=5
Why do you assume x=1?
@@charcoalblasterdogalt3057because x to the power of zero is equal to one no matter what value you plug in
@@thatoneguy611 correct, but irrelevant. raising x to the 0 power makes it always EQUAL 1, but that doesnt mean x=1
if x=5, then 5x^0=5, but 5x=25, not 5
Test designer should be marked down for dropping the degree symbol. My HS math teacher would be very disappointed in them.
Including the degree symbol can be misleading because it could be interpreted as a zero exponent. The problem would be better understood if the angle was not labeled degrees and to state that they are in terms of degrees using a sentence.
x^0 = 1 and 2x^0 = 1 right? So answer should D?
This 0 means degree like 15° C, not power, or exponent!
That's a degree symbol, not 'to the power zero'
The drawing itself shows the answer is 90 degrees. The task should have been to find ``X``, which is 18 degrees.
“No math during summer” lol
You're just assuming that that is a straight line and not 179⁰/181⁰.... it's only marked as 90⁰ on one side, and we know nothing about the angles on the other side. We only have enough information to solve the problem IF we ASSUME that all 3 of the missing angles add together to 90⁰
Your answer is based on the assumption that the line shown is straight.
It isn't indicated in the diagram that it is.
THANK YOU
Idk on tests graphs are true to size all the time like they are rarely not true to size
@@idonated50jellybeanstothew56 can you determine the straightness of a line with 100% certainty?
@@nuberiffic ye I can use a ruler
@@idonated50jellybeanstothew56 and you are 100% confident that the ruler has zero curvature?
Omggg how I suppose to pass the SAT with those types of questions:(((
😂
My mouth:Drooling
My brain: *intense thinking*
No math during summer..
Got me dying😂😂😂😂
When there are 2 correct answers I think the best answer should be used. D is the best answer
i spent like 5mins looking at this question because i felt like 90° was a too simple answer for it to be right
It is too simple to be right. You cant assume the angles add up to 90, that info isnt given
Why did I accidentally read the degrees symbol as an exponent of 0? 🤦🏼♀️ I was so confused
I don't understand how anyone can get that wrong. Even without knowing anything about math, the answer is so obvious.
Oh really? Whats the answer then?
I’m fairness it doesn’t say it’s a right angle on the other side, could be 91° and just very close to being a perfect straight line
I love that I pause these videos to work it out myself and my brain just gives my the answer I wish and then I let him tell me the working. Keeps my brain sharp
I don’t think you can asume the rest of the angle is 90 degrees. No where on that paper does it say that it is 180 degrees.
Did you pass 4th grade?
That is what the square signifies, a 90 degree angle. A line is equal to 180 degrees.
This actually makes sense cause if you take a page from a book and pretend it’s Santa for a school play it ends up delicious
The sum of 1 + 5 is a basic arithmetic operation that can be solved using addition. The result of this operation is 6.
To solve this problem, we can simply add the two numbers together as follows:
1 + 5 = 6
This is a simple and straightforward calculation that does not require any advanced mathematical techniques or concepts.
However, if we want to be more "genius" about it, we can think of this problem in a more abstract way. For example, we can think of 1 + 5 as a problem of combining sets. We can represent the number 1 as a set with one element, and the number 5 as a set with five elements. Then, we can combine these two sets to get a new set with six elements.
Alternatively, we can think of 1 + 5 as a problem of counting. We can start at 1 and count up by fives until we reach 6.
These more abstract ways of thinking about the problem can help us to develop a deeper understanding of the concepts of addition and number. However, they do not change the fact that the sum of 1 + 5 is 6.
In summary, the sum of 1 + 5 is 6. We can calculate this using basic addition, or we can think of the problem in a more abstract way using sets or counting. These more abstract ways of thinking can help us to develop a deeper understanding of the concepts of addition and number.
Does this have anything to do with the video
5x = 90
÷5
X=18
The question says 5X but you would normally look for x (18)
When I see a problem like this I automatically shut down. I have a fear of math, for real.
I can tell you scored high on your SAT. good work!
I cant be sure those lines are completely straight so the question is null and void
The square tells u the angle is 90
Lines that appear to be straight, are straight, unless otherwise specified.
there is always math during the summer
"you can't be sure the lines are straight!" how else are you supposed to solve it lmao
Lines that appear to be straight, are straight, unless otherwise specified.
The reason why so many people got this wrong is because its not something a normal person would actually ask
I think ppl got it wrong because they don't read the question.
Common mistake probably ppl choose 18.
Because usually they would ask the value of X and not 5X or 4X etc.
Theyre all to the power of zero, so its actually 5x =5. Just because it looks like a straight line you cannot assume it's a straight line
Just saying, this reasoning might work for a middle school math problem, but having the 90 deg indicator on one side of that segment doesnt mean that the other side is also 90 degrees. You would meed to show that the bottom line is in fact one line using arrows on the ends.
I mean you can see that its obviously 90 degrees
@@idonated50jellybeanstothew56 thats the thing though, just because it looks 90 doesnt mean it is. In the world of machining and engineering you dont get to make assumptions like that.
@@LawsofPhyzix yeah but on tests it’s like always modeled to scale
Ans) Option C )90
From the figure we have ,
x degree + 2*x degree + 2 x degree = 90 degree
5*x degree = 90 degree
5*x*π/180 = π/2
5*x = 90
Thus, Ans is 90
😂 this is totally wrong
@@lavasmilling5333 Ahh 1° = π/180 radians
I can't understand why you're using pi in this
11th class maths ,due to π conversion both the sides π gets cancelled making it easy to solve
@@shravanidhoke236 ok fine
Sorry because im 9 th
Congrats to Ray and W to Kai for supporting him 🥳
That’s a cheeky question!
You had me second guessing myself at the beginning there I got it in 2 seconds
Lol, I just assumed it asked for the value of x. I was like, why are you done already? 😂
"no math during summer" is wild😭😭
There's actually no way of telling that that's a straight line
It's a standard expectation in geometry problems, that if a line appears to be straight, you're meant to assume it is straight. Unless it is otherwise specified.
Lol d just made me laugh 😂😂😂
Man this things was soo easy i thought there was a trick
Whats the answer then?
Ye to hum apne 6 class me bana Tera hai..😂😂
I love how he goes through all the explanation to still get it wrong.
D.
What is the value of \(5x\)?
1. The diagram shows three angles: \( x^\circ \), \( 2x^\circ \), and \( 2x^\circ \).
2. These angles together form a right angle, which is \( 90^\circ \).
3. Therefore, we can write the equation:
\[ x + 2x + 2x = 90^\circ \]
4. Combine the terms:
\[ 5x = 90^\circ \]
5. Solve for \( x \):
\[ x = \frac{90^\circ}{5} = 18^\circ \]
6. Find the value of \(5x\):
\[ 5x = 5 \times 18^\circ = 90^\circ \]
So, the correct answer is C) 90.
I was waiting for it to be a trick question but it never came lol
If a ton of people get this problem wrong, then there are a ton of idiots. In geometry, it doesn’t get much simpler than this.
The correct option is A.. It's 18° per angle.✅
Very smart ❤
Yes, per angle, but it's asking for 5x, so even if you solved for x, you'd need to multiply it by 5, which is 90
I don't get it - can you make a long video splainin' it?
Honestly, until this exact second, I thought those were exponents! 🤦🏻♂️
Please include that these are not raised to the power of zero
No math during summer!🤣🤣🤣
My brain would’ve solved for x the multiplied by 5 just to be mad af the answer was right in front of me lmao
Its not right in front of you, you cannot solve for x because the sum of the 3 angles is not given in the picture
"No math during summer"
Me: YES, YESSSSSSS, YOURE DAMN RIGHTTTTT
For some reason I thought you were solving X, I didn't get where 5x came until the end 🤣🤣
A ton of people were drinking the night before
That bottom line could be a 12 degree angle for all we know
Lines that appear to be straight, are straight, unless otherwise specified.