Mathematics · Mensuration

The radius of a sphere is 21 cm. It is cut into two equal halves by a plane passing through its centre. What is 75% of the curved surface area (in cm 2 , rounded off to the nearest tens) of the resulting hemisphere? (Take π = 22 7 )

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2080

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The radius of a sphere is 21 cm. It is cut into two equal halves by a plane passing through its centre. What is 75% of the curved surface area (in cm 2 , rounded off to the nearest tens) of the resulting hemisphere? (Take &pi; = 22 7 )