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Wait, I thought rectangles hadan area of l x w, what's goingon here? Why do you thinkwe're using 2nr instead of l?

Wait, I thought rectangles hadan area of l x w, what's goingon here? Why do you thinkwe-example-1

1 Answer

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The tube part of a cylinder looks like a rectangle in the flat net. To make the cylinder, it has to be curved around to follow the edges of the circulars ends:

So, we can find the surface area of a cylinder as


SA=2\pi\cdot r^2+(2\pi r)(h)

Wait, I thought rectangles hadan area of l x w, what's goingon here? Why do you thinkwe-example-1
User ISHIDA
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