This dude isn't annoying or meandering at all. Truly refreshing, thank you.
@jcker.25
4 жыл бұрын
Who is here at 2020 and got assigned this in online CLASS...
@Zailscode
4 жыл бұрын
Yup
@MiguelPerez-sq3tc
4 жыл бұрын
Yup
@Rickywidablicky
4 жыл бұрын
Same
@jay3xfn286
4 жыл бұрын
Yup
@caylathomas587
4 жыл бұрын
mee
@gihalersebastien2477
5 жыл бұрын
All that to get one answer maths is so fustrating
@atharvahalapeti9775
3 жыл бұрын
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.
@angelhaven21
10 жыл бұрын
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!
@mashupstyles2389
10 жыл бұрын
XD true :P
@safewordpineapple3828
10 жыл бұрын
Your videos helped me so much i passed my math class because of your videos
@myg1856
6 жыл бұрын
Thanks for explaining this to me, I'm preparing for grade 8 math so this was a big help!
@darkangle3966
Жыл бұрын
Same
@S.K.INNOVATIVE
11 ай бұрын
Me too dear
@infernotara870
3 жыл бұрын
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
@zanenghe
3 жыл бұрын
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.
@blayy9916
5 жыл бұрын
I'm in 7th grade and this helps so much for my class bc everything my teacher says is over my head
@hellowayward
5 жыл бұрын
My teacher doesnt even teach us the math
@cathlenecruz8302
3 жыл бұрын
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
@Venom-Store
2 жыл бұрын
Its amazing how your now in grade 10 :) im in grade 7 now
@MsHoneybooboochild
10 жыл бұрын
I got none of that...... Nice video!!!! I love your other videos!!!!!
@katies9468
3 жыл бұрын
Same. I had to do this for homework and I just used the formula for volume and got the right answer.
@kaus05
3 жыл бұрын
@@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
@TheGreatAvocado
12 жыл бұрын
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!!!!
@sereenairlines
4 ай бұрын
For the surface area I think this would be easier: 2pi(radius) (radius + height) =2pi (4) (4+8) [use calculator] =96pi :)
@t4k3ntf
5 жыл бұрын
I have milestones tomorrow, this really helped me out thank you so much!
@larryhopehum721
8 жыл бұрын
finally ! thank you, I don't know how you did it but you are a genius, my sister finally got it.
@logicisarace9824
6 жыл бұрын
8:08 Volume= Pi x radius (squared) x height
@jamesdenoia
10 жыл бұрын
My book says square the radius, multiply by pi, and multiply by the height
@angelhaven21
10 жыл бұрын
It's really complicated how you unrolled the cylinder and did something with it? ...
@fredyan9805
8 жыл бұрын
Unroll it then find the area. Use the circumference of the circle and hight
@shirelchandra665
3 жыл бұрын
he's just showing how you would find the lengths of the middle part of the cylinder. Basically imagine it as a rectangle.
@alanday5255
6 жыл бұрын
Thank you for such a clear and straightforward explanation
@jahhovi6271
10 жыл бұрын
You rock. Ive gotten many A's on my tests by watching your videos
@amuusee
5 жыл бұрын
Jonah N. straight As? ;)
@thescruffinator8830
4 жыл бұрын
@@amuusee I just woke up so I thought you were calling him a rock in the same way you would say, "you idiot!"
@spooktspeek
4 жыл бұрын
@@thescruffinator8830 same except i didnt just wake up lmao-
@KimMichelle
8 жыл бұрын
Khan academy you're suppose to help us not confuse us! I'm sorry I'm just really confused...
@Mo0m0oSaZn
8 жыл бұрын
+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.
@denniscanan
8 жыл бұрын
Then ur stupid
@animeiscool9701
8 жыл бұрын
how is this topic hard? this is toddler level math....spaz
@janedoe4818
8 жыл бұрын
sorry, Kimberly, that some people are rude, disrespectful and need to grow up. you are much better than they.
@1343-p4u
7 жыл бұрын
this is easy though he can't explain it any other way
@NinjaMinkzx
13 жыл бұрын
My teacher asked my class who heard of Khan videos... I was proudly the only one who raised their hand!
@zanetinawi4161
5 жыл бұрын
Thank you so much I passed my test cuz of this
@emersenbarnes8455
7 жыл бұрын
Khan academy got me through grade 10, thank you!
@michellestephens2612
6 жыл бұрын
This is the best explanation I have found...finally understand. Thank you!!
@melaniemayberry4097
Жыл бұрын
This was very helpful and I'm ready for my quiz.
@sensible8850
7 жыл бұрын
Thank you! It helped alot!
@musicinroblox573
9 ай бұрын
Who is watching this in 2024👇🏼
@cowcuttie7119
Жыл бұрын
Omg I’m a 7th grader taking math 8 and algebra1. Doing my summer homework right now you helped so much!! 🙏🙏
@elianj.gonzalez3886
7 жыл бұрын
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
@ekenealadiume1496
9 жыл бұрын
Thanks for the info not confusing at all THANK YOU KHAN ACADEMY
@ekenealadiume1496
9 жыл бұрын
Can you please send me videos on science not just math
@SubscribersWithaFewVideos
5 жыл бұрын
He does do science
@sameermustafahraza2093
7 жыл бұрын
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!
@britneylucas930
2 жыл бұрын
I love your videos it helps my kids so much make more
@denniscanan
8 жыл бұрын
0:55 "That's what she said"
@SnowyShadow
8 жыл бұрын
I don't get it
@nekosquealer3423
7 жыл бұрын
It's King Dave r u kidding?
@tylera2341
7 жыл бұрын
Tips For Pets K
@cr7beast937
6 жыл бұрын
Dennis CANAN 8
@SubscribersWithaFewVideos
5 жыл бұрын
0:59*
@francescacolby6513
6 жыл бұрын
How do I find radius given perimeter and height????? Why is there no videos on it anywhere
@GotRxcks
12 жыл бұрын
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
@apex7598
12 жыл бұрын
i wish i had you as my teacher :)
@Chan_FN
Жыл бұрын
Such good writing skills! 🤩
@abbywittorff2096
4 жыл бұрын
even though this was an amazing tutorial I still hate, no, greatly dislike math
@BigSmokeMUFC
3 жыл бұрын
Same but hey u gotta do what u gotta do.
@V4lorLol
4 жыл бұрын
This man studies the entire English language on the way to the point.
@Ewumm
4 жыл бұрын
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
@V4lorLol
4 жыл бұрын
@@Ewumm it takes maybe 1 minute to explain these things.
@Ewumm
4 жыл бұрын
@@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
@krishnac62
6 жыл бұрын
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).
@dingring4015
3 жыл бұрын
This video helped me with my gsce math equations.
@johnmartinello41
11 жыл бұрын
all of your videos have helped get better grades in my math
@recoil33
13 жыл бұрын
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]
@dmnlord3469
Жыл бұрын
Did you get your answer after 12 years😅
@christiangirl1275
6 жыл бұрын
He did a little bit extra (no offense) but all you have to do it apply the formula for surface area of the cylinder which is: 2πr^2 + 2πrH (2 times pi radius squared plus 2 times pi radius squared times height) In this problem you would used substitution and it would look like this: 2π4^2 + 2π4(8) You should get the same answer.
@GBIAE
8 жыл бұрын
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
@saia9266
7 жыл бұрын
this will really help me on my tests
@calumbutler2871
6 жыл бұрын
Guys the formula is "~r2xh" or pi R2 times the height of the cylinder!
@unknownunknown5307
3 жыл бұрын
Best teacher ever
@Josh49842
4 жыл бұрын
These videos are so helpful and make math so much fun I just wanted to find this channel to subscribe. :o
@royalrick1
4 жыл бұрын
Thanks for this, it really helped!
@jyotiramjagtap5377
6 жыл бұрын
The inner and outer radii a cylindrical pipe are 4 and 5 cm respectively.find the area of the cross sections of the pipe.
@mashupstyles2389
10 жыл бұрын
I don't need to learn it now.... I understood! ;)
@loganbandura7595
3 жыл бұрын
trying to earn my ged so thank you for helping me.
@janedoe4818
8 жыл бұрын
omg,, i totally could not keep up with this....too much talking....too many numbers. ugh, my head.
@calumbutler2871
6 жыл бұрын
Jane Doe well what part are you really struggling with?
@michaelhernandez2075
2 жыл бұрын
many thanks
@luwamalem9537
6 жыл бұрын
So easy once you get it!!🤗👌
@matthewm81
10 жыл бұрын
2 times pi times radius square + 2 times pi times radius square times height square.
@TradeAlgoPremier
5 жыл бұрын
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.
@Bigcheese174
Жыл бұрын
🤓
@GraphiteWizard
11 жыл бұрын
Thank you! Quiz studying time!!!!
@OfficialArmaniJ
8 жыл бұрын
im in a lower grade and my teacher said im high school level awesome thanks khan
@Soda-wn8bz
7 жыл бұрын
That was so helpful,thx sal
@paulinarojas8871
4 жыл бұрын
4:44
@Vincisomething
11 жыл бұрын
So, basic rule of volume is area of whatever surface area you're dealing with X the "depth"/ "how deep" it goes?
@awesomeg7284
9 жыл бұрын
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??
@anushkabhandari9508
3 жыл бұрын
I like the around of the celiendar
@harsha2514
8 жыл бұрын
thank you... very much.....
@VishalYadav-ve3yi
6 жыл бұрын
a cylinder is 12 m long 9 m wide and 4 m deep.Find the value of constructing the cylinder if the cost of the iron sheet 25 RS. per m.find the value.
@rmantech
12 жыл бұрын
Great Video!!!!! HELPED A LOT!
@Mr_Secrate__
6 жыл бұрын
Best explained..👍👍👍👌
@lorenzoserrano
6 жыл бұрын
Awesome thx!
@Chan_FN
Жыл бұрын
Who is here at 2023 and got assigned this
@joellewyjackson1323
4 жыл бұрын
Thanks.☺☺☺
@bbqsace749
6 жыл бұрын
Surface Area Forumla is 2πrh+2πr2 and the volume forumla is πr2h
@ChiragSonne
2 жыл бұрын
thanks Sal Khan
@mbplumbing4499
5 жыл бұрын
amazing video
@jonathantidwell3389
11 ай бұрын
Really good at drawing lol
@kaitlini.7972
9 жыл бұрын
Thank you!
@collinsenecal649
6 жыл бұрын
SOOOOOOO Helpful
@songbird5074
7 жыл бұрын
You're great!!! but i'm confused yayayayay
@SilentKiller-hw2pm
7 жыл бұрын
this helps alot for school
@freshmen6255
7 жыл бұрын
I absolutely hate math teachers that make the easiest stuff confusing.
@yuki8651
10 жыл бұрын
I got 87.92cm cubed for the volume and 50.24cm squared for the Area or the radius. Correct me if I'm wrong please but you are kinda confusing me.
@alexkartwright6275
4 жыл бұрын
Why do you not multiple the 16 by Pi?
@naskensei
10 жыл бұрын
He gave the volume to you, JUSTIN!!
@elijahhippolyte3137
10 жыл бұрын
Cool math
@Alacalythmia
11 жыл бұрын
Thanks
@Delighted_Rose
2 жыл бұрын
what is the different between area , total surface area and surface area?
@dilo2073
11 жыл бұрын
well said
@bar95900
13 жыл бұрын
what if that cylinder is divided into three different circular partitions (three compartments). how do you find the dimensions of the tank that correspond to the tank of minimal weight. This is a calculus problem. thanks.
@fcinternetmarketing
11 жыл бұрын
Helpful video.
@cartoonfanish
12 жыл бұрын
Very nice.
@redevanz323
5 жыл бұрын
How to find the radius in cylindrical if the given is volume and lateral or surface area?
@pstuddy
13 жыл бұрын
how do you draw and write so well with the mouse???? i'm impressed
@thetheyinthatswhattheysay1618
3 жыл бұрын
yeeessss thoooooo
@lamyab6324
9 жыл бұрын
THANK YOU SO MUCH
@elliotfong8794
3 жыл бұрын
Always one person to admire
@calumbutler2871
6 жыл бұрын
3.14 x r2 x h= and remember to evaluate or BEDMAS go in order!
@ChazZen
13 жыл бұрын
hey, if u do a cone. is it true that all cones are 1/3 the volume of a cylinder that they perfectly fit?
@dublxml
6 ай бұрын
12 years later and his mic is still better than mine
@Ada20able
13 жыл бұрын
That was a little complex..got to hit the replay button.
@msharma19792000
6 жыл бұрын
if volume is 1100 cm cube and radius of base is 5 cm find curved surface area
Пікірлер: 456