TSA of hemisphere???
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The surface area of a sphere of radius r is 4 π r2. Half of this is 2 π r2. ... If you have a hemispherical object then it has a base which is a circle of radius r. The area of a circle of radius r is π r2 and thus if the hemisphere is meant to include the base then the surface area is 2 π r2 + π r2 = 3 π r2.
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