Wonderful explanation, Mr Woo, especially in combination with providing the students with their own net from which to construct their own cone. Splendid video.
@dawsontate2989
Жыл бұрын
Thank you so much for explaining why the formula is what it is. So many math videos focus on just showing the formula and telling you to plug in values, rather than explaining the why.
@Aarush1-INDIANEXO-L
8 ай бұрын
Am an Indian student in 10th grade and I have been lately realizing how obsolete Indian education system is. But I am so grateful that i finally understood the curved surface area's formula derivation from you. Keep inspiring and helping us sir. Much love from India.
@devj4047
3 ай бұрын
BRO YOU ARE ACTUALLY THE GOAT
@pianoboss6000
3 жыл бұрын
My brain was blown. This was an amazing explanation!
@tanelkagan
2 жыл бұрын
Great stuff as ever but I would have liked to have seen this go just a little further, which is to (also) express the surface area in terms of r and h, since these are going to be typically the most common values provided. By Pythagoras' Theorem, l² = h² + r² so we can rearrange to get l = √(h² + r²). Plugging that in to A = π r² + π r l gives: A = π r² + π r√(h² + r²) and factoring out the πr we get:- A = π r (r +√(h² + r²)) Yes, it's a little more complicated, but not by much. Another way of looking at it is that given h and r you would use Pythagoras to get l, so in essence you're performing the same calculations but just saving a step or two - perhaps!
@gadoliumnitrogen7149
5 жыл бұрын
Had to watch this as well in class! Hi, 9.B math :)
@thomasrowley6643
3 жыл бұрын
Thank you for your clear explanation. I now understand why the area of a cone is πr^2+πrl . :)
@hallabolgaming9963
Жыл бұрын
its not the area its the surface area 😊
@ananiaslabisi6724
4 жыл бұрын
great explanation - keep it up my man
@aguyontheinternet8436
2 жыл бұрын
Managed to explain it without going into calculus, series, and infinity. Cool.
@mercie5630
7 ай бұрын
So wonderful,, you have an amazing content
@zubair1411
5 жыл бұрын
How is the length of arc equal to circumference of the top circle...
@ansyyxux
5 жыл бұрын
Make a cone and unfold it and you'll see
@logiprime
4 жыл бұрын
You have my subscription thank you so much for the help!
@tedburacas8483
5 жыл бұрын
What grade is this?
@michelleyang2707
5 жыл бұрын
11th? Idk lol. I'm in 8th-grade learning IM 3 which is 11th-grade math.
@crimsonbaddy
5 жыл бұрын
@@michelleyang2707 😂 Misconception.. The thing is that we have to learn same thing but in a advance way. Maybe his student are dumb and now their eye's got open and started studying !
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