How to calculate the side area of a cylinder?

s=h×c

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2. The area formula and derivation process of each figure I didn't want to give points, but there are many. If the answer is simple and correct, 10 points will be added Rectangles, squares, circles, triangles, trapezoids and other elementary school on the line, is a plane graphics. There is also a derivation process
3. The derivation of the volume formula of a cylinder is based on the mathematical idea of (). In this process, () has changed and () has not changed. The height of the assembled figure is equal to that of (), and their bottom area (), so the volume formula of a cylinder is ()
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11. How did he derive the formula for the side area of a cylinder
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