1.

A sphere of 17 cm radius is cut by two parallel planes which are 7 cm apart but on the same side of the centre of the sphere. The radius of one of the ends of the zone (or frustum) is 8 cm. What is the total surface area of the smaller spherical cap of the two?

Answer»

`72pi`
`81pi`
`68pi`
NONE of these

Answer :A


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