Cylinder volume and surface area | Perimeter, area, and volume | Geometry | Khan Academy
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- čas přidán 11. 04. 2011
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Finding the volume and surface area of a cylinder
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still better than any teacher ive had
You sure about that ?
Noah Cherepak same
@@naskensei YES HE IS AND SO AM I TEEHEE 😂
fr
surface area: 3:25
Hope this helped 😊
it did
Thanks bro
Arooj Malik the goat
well thank u
A year later but thx
This dude isn't annoying or meandering at all. Truly refreshing, thank you.
Who is here at 2020 and got assigned this in online CLASS...
Yup
Yup
Same
Yup
mee
All that to get one answer maths is so fustrating
You can shorten the method at your will. Sal is just taking you through the process of thought that you should use to get to your anwser.
Your videos helped me so much i passed my math class because of your videos
Thank you so much. The rest of the videos I've watched have people who have the worst voices ever, I'm glad you teach very well and don't talk like we are idiots.. Thanks again!
XD true :P
I love how school ruin your grades by forcing you to learn about stuff you will never use a single Tim in your 80 years of living
fractions are used for cooking, almost every form of math is used for taxes, to build a house you need to use math to figure out how much space you need for your belonging, and science will be used for physics for college if you want to get out of it, reading can be for taxes, bills, etc.
Thanks for explaining this to me, I'm preparing for grade 8 math so this was a big help!
Same
Me too dear
I'm in 7th grade and this helps so much for my class bc everything my teacher says is over my head
My teacher doesnt even teach us the math
my teacher just writes the problem down and then takes a second, looks at the answer, and says well that was easy lets try another one. He doesnt even talk most of the time he just writes the problem and answer down
Its amazing how your now in grade 10 :) im in grade 7 now
I got none of that......
Nice video!!!!
I love your other videos!!!!!
Same. I had to do this for homework and I just used the formula for volume and got the right answer.
@@katies9468 well the point is to understand where the formula is derived from sal basically takes you through the thought process, its better to understand this way so its easier to recollect the formula if you ever need it later in life
Today is going to be pre much watching massive amounts of khan videos because I need to get a 74 on my final exam to pass my math 9 course this friday!!!!
I have milestones tomorrow, this really helped me out thank you so much!
Thank you for such a clear and straightforward explanation
My teacher asked my class who heard of Khan videos...
I was proudly the only one who raised their hand!
finally ! thank you, I don't know how you did it but you are a genius, my sister finally got it.
My book says square the radius, multiply by pi, and multiply by the height
8:08
Volume= Pi x radius (squared) x height
Thank you! It helped alot!
Thanks for this, it really helped!
i missed a day in school and i needed to catch up and i did with this video thank you so much you are my hero
Thank you! Quiz studying time!!!!
Khan academy got me through grade 10, thank you!
thank you so much! i have a gr9 math exam tomrow and without this i woulda failed it! thans soo much! :D THIS HELPED SO MUCH
It's really complicated how you unrolled the cylinder and did something with it? ...
Unroll it then find the area. Use the circumference of the circle and hight
he's just showing how you would find the lengths of the middle part of the cylinder. Basically imagine it as a rectangle.
Thank you so much I passed my test cuz of this
This is the best explanation I have found...finally understand. Thank you!!
Great Video!!!!! HELPED A LOT!
this will really help me on my tests
all of your videos have helped get better grades in my math
That was so helpful,thx sal
awesome thanks!
i wish i had you as my teacher :)
This was very helpful and I'm ready for my quiz.
These videos are so helpful and make math so much fun I just wanted to find this channel to subscribe. :o
You rock. Ive gotten many A's on my tests by watching your videos
Jonah N. straight As? ;)
@@amuusee I just woke up so I thought you were calling him a rock in the same way you would say, "you idiot!"
@@thescruffinator8830 same except i didnt just wake up lmao-
Helpful video.
Awesome thx!
So easy once you get it!!🤗👌
Thank you!
I love your videos it helps my kids so much make more
0:55 "That's what she said"
I don't get it
It's King Dave r u kidding?
Tips For Pets K
Dennis CANAN 8
0:59*
This video helped me with my gsce math equations.
Such good writing skills! 🤩
Can be confusing at times but watch the video again and again and copy each step practically just like how he does and u will understand it. Geez, people are very ungreatful these days!
Khan academy you're suppose to help us not confuse us! I'm sorry I'm just really confused...
+Kimberly Michelle (K.M) What specific part are you confused about? Hard to help when you don't specify and saying "all of it" definitely won't help.
Then ur stupid
how is this topic hard? this is toddler level math....spaz
sorry, Kimberly, that some people are rude, disrespectful and need to grow up. you are much better than they.
this is easy though he can't explain it any other way
Thanks for the info not confusing at all THANK YOU KHAN ACADEMY
Can you please send me videos on science not just math
He does do science
Thanks , excellent explanation khan bhai Well Please help me to find out of volume in partially filled tank.
Question : A horizontal Cylindrical tank measuring 60 c.m in diameter and 150cm in length is partially filled with water to a heigh of 48cm ,Find the volume of water in litre.with method
thank you... very much.....
SOOOOOOO Helpful
Best teacher ever
Omg I’m a 7th grader taking math 8 and algebra1. Doing my summer homework right now you helped so much!! 🙏🙏
Best explained..👍👍👍👌
Thank u very much
THANK YOU SO MUCH
visto desde Nicaragua thanks
Very nice.
well said
this helps alot for school
this is very smart..
amazing video
many thanks
Nice job
I love this
im in a lower grade and my teacher said im high school level awesome thanks khan
thanks Sal Khan
This man studies the entire English language on the way to the point.
he's just trying to cover it in as many ways as possible so that everyone watching gets it, no matter how their mind processes the information
@@Ewumm it takes maybe 1 minute to explain these things.
@@V4lorLol if they were to explain it in one way, the way that you understand it. but for a large audience, you need to be a bit more vast with your explanations
How do I find radius given perimeter and height????? Why is there no videos on it anywhere
What computer software is this? What is this called? Thanks. These geometry vids are really helping me out for my quiz
thank u sooo much
Thanks.☺☺☺
For the surface area I think this would be easier:
2pi(radius) (radius + height)
=2pi (4) (4+8) [use calculator]
=96pi
:)
3:27
MatterWolf thank you
Wow this was 3 years ago....
And I still remember why I did this
here for summer work, thank you for the help.
also how are you so good at drawing with a mouse, is it possible to learn this power?
Always one person to admire
Khan,
When deriving a cylinder Area/SA equation for a optimisation question, what exactly do you do it with respect to? [ I have to maximise Surface area, given that the volume of the can is 130cm^3; and i have to include the S.A of the top and bottom]
Did you get your answer after 12 years😅
especially on my test of surface area
thanksss
The inner and outer radii a cylindrical pipe are 4 and 5 cm respectively.find the area of the cross sections of the pipe.
Awseome
So, basic rule of volume is area of whatever surface area you're dealing with X the "depth"/ "how deep" it goes?
i love KHAN ACADEMY
I like the around of the celiendar
I don't need to learn it now.... I understood! ;)
I believe the circumference should be the length that we need to calculate the area of the cut rectangle. 8 pie should be the circumference based on the standard equation.
🤓
Thanks
so colourfull
trying to earn my ged so thank you for helping me.
how do you draw and write so well with the mouse???? i'm impressed
yeeessss thoooooo
Guys the formula is "~r2xh" or pi R2 times the height of the cylinder!
4:44
i like your videos
He gave the volume to you, JUSTIN!!
Cool math
12 years later and his mic is still better than mine
uhm sir. how about if the cylinder is tilted let's say 30 degrees. How are we going to get the maximum amount of water, ( this is the volume) the cylinder can hold??
Volume = (Area of circle)* height = πr^2h.
Surface Area = 2(area of circle) + (circumference of the circle * height of the cylinder) = 2πr^2 + 2πrh = 2πr (r + h).
How to find the radius in cylindrical if the given is volume and lateral or surface area?
hey, if u do a cone. is it true that all cones are 1/3 the volume of a cylinder that they perfectly fit?
god bless your soul
God bless you too :
You're great!!! but i'm confused yayayayay