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A golf ball is spherical with about 300-...

A golf ball is spherical with about 300-500 dimples that help increase its velocity while in play. Golf balls are traditionally white but available in colours also. In the given , a golf ball has diameter 4.2 cm and the surface has 315 dimples (hemi- spherical) of radius 2mm
Based on the above , answer the following questions:

(i) Find the surface area of one such dimple
(ii) Find the volume of the material dug out to make one dimple
(iii) (a) Find the total surface area exposed to the surroundings
(iii) (b) Find the volume of the golf ball.

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