Find the volume of a triangular prism and cube | Geometry | Khan Academy
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- Опубліковано 10 лют 2025
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In this tutorial we'll practice finding solid geometry volume. Keep paper and pencil nearby in case you want to remember the formulas.
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Man, 55 minute lecture: wasted my time
4 minute vid: understand everything
Thanks helped me alot
Right!
SO FREAKIN TRUE MAN!
The problem with class lessons is that the school makes them teach useless methods that are incredibly confusing even if the teachers know how to teach it in a better way, i could definantly learn all i needed from khan academy without confusion.
shutup and go, prob took you 5 minutes to figure out how to spell lecture, just go you stuped 5 year old
@@Anikafrl and lol, you called him 5 year old when literally you spelled stupid "stuped" lololol
Omg I'm glad I found this. During math we are learning this. This helped me. Understand it a little bit.
Wow. Really amazing!! I love this!! This is gonna help me so
much. Thank you !!
Soo fascinating factor I needed this in life
Been struggling only with the triangular prism. Tomorrow I have a huge test of volume in geometry class.
Just same
Same!!!
Bro same, I was absent for 4 days and I missed a lot in class.
Did you fail?
How did ya do?
This video is so helpful, his voice makes me feel so good, and the way he used his words makes me understand this way more!
my man's out here explaining this in 3 minutes when my maths teacher couldnt in 1 hour, thank you
@markgriz I suppose you could perform the division first here, but the way I did it is not "incorrect". There's no rule that says division before multiplication, and you don't necessarily proceed left to right. It depends on the presence of parentheses and the orientation of the notation. I chose to multiply first because the 2 was right up against the (9 + 3); if it had appeared as 48÷2 (9+3) or (48÷2)(9+3) maybe I'd have done it your way. The original question seems to have been ambiguous.
Thanku so much i really needed it i know how to do it but forget
Take It Eazy yea same here
Thank you so much, this helped me a lot in a test that I didn't understand :)
This helped. Thanks!
I was confused but at the End I understand how we do. the triangle
Wow. It's a miracle and it helped me.
OH MY GOODNESS THANK YOU SO MUCH!!!!
Think about this the people who were commenting 8 years ago are now in college or are not in college but done with school 😳
when you realize nobody's looked at a video for 7 years... :-P
hmm...
Hmmm...
Hmmmm….
@Crissix100
Incorrect
48/2(9+3) = 48/2*(9+3) = 48/2*12 = 24*12 = 288
multiplication and division are performed in order left to right.
To get the answer of 2, you would have to perform the multiplcation 2*12 before doing the division,
which is incorrect.
people in my darn math class are so distracting that it's hard to understand the lesson
So basically you find the area of the base. Then you multiply that by the depth of the figure. That’s how you figure out the volume.
One word. PEMDAS. The order of operations js parenthesis, exponents, multiplication, division, adding, subtracting. Yes it is a rule fellow commenters. There's your calculus 4 for you.
I rather not go to school and just
Watch these videos and learn math
Thanks for the hint.☺☺☺
Hey thank you this is amazing this is extremely fascinating
Thank you
@markgriz I'm a calculus 4 student, I think I can do BEDMAS. When you've seen enough formulations you'll get a feel for whet they are supposed to mean. Example, in vector algebra A . B x C must be evaluated RIGHT to LEFT. Why? Because A . B is a scalar and you can't then cross a scalar with the vector C. The "up against" actually does matter if it means that we take 2(9 + 3) to be one term, which would be reasonable. The original formulation contained that ambiguity, enough said.
@Crissix100
It most certainly is incorrect. There is no ambiguity in order of operations.
You are correct that there is no rule that says division before multiplication.
The rule is division and multiplication are equal precedence, and therefore
are performed left to right.
It doesn't matter that it was "up against" the parenthesis or not.
That doesn't give it priority. Only what is *inside* the parentheses
gets priority.
Google "order of operations" if you have any doubt
people can use BEDMAS (brackets, instead of parentheses) or even BODMAS(operations, like square roots and exponents, not just exponents
@Azrhei You probably found it already, but the answer is ( khanacademy [dot] org/about/faq#equipment ): I use Camtasia Recorder ($200) + SmoothDraw3(Free) + a Wacom Bamboo Tablet ($80) on a PC. I used to use ScreenVideoRecorder($20) and Microsoft Paint (Free).
@jambanIT Here are the steps:
48 / 2(9 + 3)
48 / 2(12)
48 / 24
2
Hope this helps :)
i got a 100% on my test
THANK YOU!
man ur amazing
Does the 1/2 still cancel out if the answer is an odd number?
Dear Dude i am in 5th grade and have 2 tests tomorrow on volume of irregular figures and have not learned anything that i need to learn for my tests because my test have bookcases and stairs ect on my test and didnt find any vids of things like that on ur vids!! :'(
My tests have items that have to be spit into more than 1 shape please make another vid tonight on figures like this because its 9:20 pm now and i have school at 7 and need to study but dont have time please help!
+lindsey jo foreman so it's been a year.... How was your test? ;__;
+Adam Zhang LOL
2 years now... how was it?
Dang i didnt learn anything about this in 5th gradr
SO WE IGNORE THE OTHER LENGTH ON THE SIDE OF THE PRISM (TRIANGULAR) ?
THE ONE ON THE OTHER SIDE OF THE TRIANGLE??
@jambanIT thats the same as 48/2x12, or 48/24.
So the answer is 2
thanks my geometry was to loud so the teacher couldnt be heard
LIL BIG lol
@midgeamoo some of the people say that it is 288 hmm.. but i think the answer is 2 too
So, what's the full formula?
Volume = 1/2 Length • Wight • Height
Or
V = 1/2 Bh
Devin Gao was here
I'm confused on how he got 1/2 . does it have anything to do with 3
The area of the triangle = 1/2*height*base
Don’t you have to find BXH area before you Do volume?
this is good
The answer is 288. You have to write it down, then you will see it.
TOOOOOO EASY
Sal, what does 48÷2(9+3) equals too? thanks.
@markgriz However, I do understand where you are coming from.
I have math exam tommorow
these comments are so dry
So what would be the formula
who here in 2020?
I dont get it, so for cube the answer is just 27
11 years late
domenik its BEDMAS (brackets,exponent,divigion,mut,add,sub)
its BIDMAS(Brackets,Indices, Division,Multiplication,Addition,Subtraction)
Johan Shahrol or BODMAS
It's PEMDAS
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction
Naoki Beaudette Nagai I learned Please Excuse My Dear Aunt Sally ( but basically pemdas)
@@johanshahrol7967 gemdas grouping exponents multiplication division addition subtraction
hmmmm
This dude is seriously not very good at explaining things. I'm glad you guys could get somthing out of this
Parett Gaming seriously? We understand this
Enable downloading, ! I dont always have acces to fucking Internet !
What half
400th like
I totally didn't understand
Man dis video boring
I can just tell you have a sibling and you’re laughing while sending this with your sibling beside you (possibly a younger sister). Trust me, I’ve seen all the sibling realities!
Or you’re forced to watch this so you typed this message when your parents weren’t looking! Genius, am I right?
Thank you