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A golf ball has a diameter equal to 4.2 cm. Its surface has 200 dimples each of a radius of 2 mm. Find is

A golf ball has a diameter equal to 4.2 cm. Its surface has 200 dimples each of a radius of 2 mm. Find is the total surface area which is exposed to the surroundings assuming that the dimples are hemispherical. Options: 1)80.58cm 2)90.58cm 3)60.58cm 4)85.58cm

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