Question

Find the total surface area of a hemisphere of radius r/2 unit.

Answer 1

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The area of a circle of radius r is πr2 and thus if the hemisphere is meant to include the base then the surface area is 2πr2+πr2=3πr2.

Answer 2

Answer:

Total surface area of a hemisphere: K = (2πr2) + (πr2) = 3πr.