TSA of hollow hemisphere of outer radius R and inner radius r is _______.
A
3π(R2+r2)
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B
π(3R2+r2)
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C
π(R2+3r2)
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D
2π(R2+r2)
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Solution
The correct option is Bπ(3R2+r2)
TSA of hollow hemisphere = CSA of inner hemispherical surface + CSA of outer hemispherical surface + Area of shaded annular disc. =2πr2+2πR2+π(R2−r2)=πr2+3πR2=π(3R2+r2)