Question

what is the formula for calculating total surface are of hemisphre of radius r ?

Answer 1

Answer:

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.

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Answer 2

Answer:

Total surface area of a solid hemisphere with radius r is, S=2πr2+πr2=3πr2.