i love 6:00 because this guy actually takes us the time to explain why its not (-1,2). the text book just tells us how to do it, not why reversing the sign on the values works.
Hey Sal, thanks for the video! :) If you hold shift on the keyboard while drawing shapes it will keep the shape uniform, i.e. you can only draw circles, or squares depending on the tool you use. :)
@idster7 Of course x and y aren't 0. They're not even on the function. You're assigning two values. In a x-y function one variable is dependent upon another. So if y=x+1, you can't say because x is 0 and y is 0 the function wouldn't work.
We will have to take the under root of the RHS in that case, I believe, it might apply to this current situation that we have (I have forgotten what it is), but it should be d = [(x-x2)^2 + (y-y2)^2]^1/2
Can someone please tell me the center of the last circle spoken about because my sound doesn't work and i cannot make heads or tails of this without the sound
how to determine the equation of a circle passing thru different points? I know the point has to be substituted in the standard form but I don't know how to continue solving after substitution. I need help :(
i think this is the first of a hundred sal videos i've watched that i haven't really gotten. i don't understand the equation x-squared plus y-squared equals 9. how could x be 0 and y be 0? that wouldn't equal 9.
my math teach flies through the math lessons and i am soo glad to have found this guy, the things sal teaches just clicks in my head
Khanic sections.
beautiful
iconic
@@nityanunna8828 ikhanic
"You'd be almost right, but you'd be exactly the opposite of the correct answer"
XD
this guy is probably an engineer: "It's supposed to be centered at zero, but that's good enough"
11 years ago and still helpful. Thank you.
Any stem student here?😂
g 11 shs? pre cal?
Here
yoo
Heey
🤣🤣 here
i love 6:00 because this guy actually takes us the time to explain why its not (-1,2). the text book just tells us how to do it, not why reversing the sign on the values works.
"you'd be almost right except you'd be exactly opposite the right answer" lmao please never stop making vids
I used your videos to help me pass a test to take Calculus in freshman year.
thank you so much i felt so left behind wheni had no idea about conic in my precalculus class...and so close to finals u really helped me out a lot :)
"Some Algebra classes like to complicate things by SHIFTING THE CIRCLE" Uhh...can someone say amen?
amen!
it would be nice if the calculations were a easy as just "shifting"
Oh my gosh I'm reviewing for my final and this is so helpful to refresh my memory. I'm so glad I found this is very helpful!!!
Hope you did well
this is so helpful!! I'm studying for my ACT and your videos are a life saver for geometry!
geez, i understand you more than i understand my math teacher.
Hey Sal, thanks for the video! :)
If you hold shift on the keyboard while drawing shapes it will keep the shape uniform, i.e. you can only draw circles, or squares depending on the tool you use. :)
13 years ago still helpful.
Where is this video on Khan Academy? It doesn't seem to be in the Conic Sections category of Algebra 2 under Circles.
It is in Algebra playlist
For the formula at 0:40 couldn't the formula be simplified by taking out the squared EX: x+y=r instead of all those squared's?
STIX you cannot cut the squares unless it is (x+y)^2 = r^2
How did the center turn into positive 1 and negative 2 while inside the equation it is vice versa
man i got to say you have saved my ass in for college
@idster7 Of course x and y aren't 0. They're not even on the function. You're assigning two values. In a x-y function one variable is dependent upon another. So if y=x+1, you can't say because x is 0 and y is 0 the function wouldn't work.
I have a exam tomorrow so i need to watch this.
This helps me a lot 👏
THE BEEPING AGHHHHHHHHHHH I CANT TAKE IT
Best video ever, totally prepared me 😉
i love your voice! ....and your teaching of course ahaha
Cause of Death: Math
That video was fire!
Sal,
Your back!
Distance formula -> (x-x2)^2 + (y-y2)^2 = r^2. If x2 = 1 and y2 = -2, you get (x-1)^2 + (y+2)^2 = r^2. Simple.
How about..
d= \|(x2-x1) + (y2-y1)
We will have to take the under root of the RHS in that case, I believe, it might apply to this current situation that we have (I have forgotten what it is), but it should be d = [(x-x2)^2 + (y-y2)^2]^1/2
Can someone please tell me the center of the last circle spoken about because my sound doesn't work and i cannot make heads or tails of this without the sound
Hey, do you use a mouse or like a pen to write this stuff out? An electric pen of course..
Anyone watching this because modules aren't enough to learn this lesson?
8:42 If the formula of the circle is C: (X - Xo)^2 + (Y - Yo)^2 = r^2 then the center's coordinates are (Xo, Yo)
Hi what app did you use for your video?
anyone know how to graph it on a computer, or any program. Need it for a school assignment
Abdullah Sher i know that this is late, but for future reference i use a program called geogebra
aside from the wheel, what are other real world applications of the circle?
Trigonometry
how about the world as an infinite amount of circles (actually ellipsoids) turned around the rotation pole?
Hahahaha "And you'd be almost right except you'd be exactly, uh, the opposite of the correct answer" Sal is hilarious
How does (X-1) ^2 + (Y+2)^2 = 3^2 and its center is (1,-2) ?? Is it given to change the sign??
I thought it was (1,4) lol hahaha
the sign should be change when you're going to plotnit
what software you use please answer asap...
R we squared?
in the end as we wanted (y+2)=4
why couldn't the value of "y" be -4 ?
Because then you'd have -4+2 = 4
2=8
or
-2=4
...
how to determine the equation of a circle passing thru different points? I know the point has to be substituted in the standard form but I don't know how to continue solving after substitution. I need help :(
i honestly hate math
+MattTrainor your gonna have a bad time
Math is eveywhere... If you hate math have fun trying to get a well paid job
+Pratyush Srivastava become a singer, celeb, artist (a great one), or a TV show writer, typical thinking.
or run for president.
MattTrainor, then I honestly hate you.😡
im an IT student and idk what the heck im doing here
Ah, x^2 + y^2 = 1 is a circle with radius 1, becomes pretty obvious once you see it from the trigonometric unit circle since cos^2 x + sin^2 x = 1 :D
I only wish this cane out last year when I had to do this. :(
"you would be almost write , except you would be exactly opposite of the correct answer" ................................wha ? lol
+Cheyne Simons i laughed so hard when i heard that
Cheyne Simons it’s spelled right
i think this is the first of a hundred sal videos i've watched that i haven't really gotten. i don't understand the equation x-squared plus y-squared equals 9. how could x be 0 and y be 0? that wouldn't equal 9.
He looks charming when he teach math😂
Thank you.
Why was it *-1,2* tho
What about his back?
anyone reviewing bc of quarantine?
😎🎖️🤩🏆☺️
What is circle?
1st comment!!
awesome video
why no audio
Wen diameter is 9. Den how is the radius 3?
Rishal Tauro it isn't diameter that's 9. It's radius squared that's 9. You simply take under root of 9 to get radius. Which is 3
THANKS
thanks bro
3:08
his back?
No, his front.
Sal !!! iam ready to challenge you that you could make it much more shorter !!!!
khan academy is goat
You talk like the Doctor
STEM PA MGA TANGA!!🤣🤣
October 5 na bukas welp
Can't understand anything huhu
translation of a circle ....
I hate Pre-Calculus.
*you're
hiiiiiiiiiiiii
Hi jh loop
@dnmn8r
Was just gonna comment that...
Well it is a low level explanation
Yow stem pss
Student*
Get some friends.