If I'm calculating the area of a curved HALF cylinder, do I just do 2 pi R sq + 2 pi R H or do I not multiply both of them by 2?

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Guest Jun 19, 2014

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Well, the surface area of the whole cylinder is

$$SA=\pi r^2+\pi r^2+2\pi rh=2\pi r^2+2\pi rh$$

So the suface area of half the cylinder must be half this much. What would that be?

Melody Jun 19, 2014

Melody · Answer 1 · 2014-06-19T02:41:33

Well, the surface area of the whole cylinder is

$$SA=\pi r^2+\pi r^2+2\pi rh=2\pi r^2+2\pi rh$$

So the suface area of half the cylinder must be half this much. What would that be?