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A semi-circle of radius 17.5 cm is rotat...

A semi-circle of radius 17.5 cm is rotated about its diameter. Find the curved surface of so generated solid.

Text Solution

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The solid generated by a circle rotated about its diameter is sphere.
Now, radius of sphere r = 17.5 cm
and its curved surface `= 4pi r^(2)`
`= 4x(22)/(7)xx17.5xx17.5`
`=3850 cm^(2)`
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