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A golf ball has diameter equal to 4.1 cm...

A golf ball has diameter equal to 4.1 cm. Its surface has 150 dimples each of radius 2mm. Calculate total surface which is exposed to the surroundings. (Assume that the dimples are all hemispherical) `" "[pi=22//7]`

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The correct Answer is:
`71.68 cm^(2)`
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