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Standard IX

Mathematics

Surface Area of Hemisphere

It cost Rs ...

Question

It cost Rs $4020$ to paint the inner curved surface area of hemisphere of radius $8 m$ . If it is painted at rate of Rs. $10 p e r m^{2}$ . Find inner curved surface.

402 m^{2}

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400 m^{2}

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200 m^{2}

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201 m^{2}

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Solution

The correct option is A $402 m^{2}$
CSA of hemisphere $= 2 π r^{2}$
$= 2 π {(8)}^{2} = 2 π \times 64 = 402$

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It cost Rs 4020 to paint the inner curved surface area of hemisphere of radius 8m. If it is painted at rate of Rs.10perm2. Find inner curved surface.

The correct option is A 402m2CSA of hemisphere =2πr2=2π(8)2=2π×64=402

It cost Rs $4020$ to paint the inner curved surface area of hemisphere of radius $8 m$ . If it is painted at rate of Rs. $10 p e r m^{2}$ . Find inner curved surface.

The correct option is A $402 m^{2}$
CSA of hemisphere $= 2 π r^{2}$
$= 2 π {(8)}^{2} = 2 π \times 64 = 402$