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Find the surface area of the full sphere [ A = 4 pi R2 ] and then take half of it.

You wind up with [ 2 pi R2 ] for the outside surface area of a half sphere, or

[ 4 pi R2 ] for the (inside + outside) surface area of the half sphere. (Since

the inside and outside are now both exposed to the weather, you probably

want to paint both surfaces.)

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Q: How to find the surface area of a half sphere?
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