Q.

Total surface area of a narrow hemisphere of external and internal radii R and r is given by

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a

π(R2+3r2)

b

3π(3R2+3r2)

c

π(3R2+r2)

d

π(3R2+3r2)

answer is C.

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Detailed Solution

Question Image

T.S.A=2πR2+π(R2r2)+2πr2

=2πR2+πR2πr2+2πr2

=3πR2+πr2

=π(3R2+r2)

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Total surface area of a narrow hemisphere of external and internal radii R and r is given by