A golf ball has diameter equal to 4.2 cm. Its surface has 200 dimples each of radius 2 mm. Calculate the total surface area which is exposed to the surroundings assuming that the dimples are hemispherical.

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Solution

Surface area of ball

Total surface area exposed

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A golf ball has a diameter equal to $4.2 c m .$ Its surface has $200$ dimples each of radius $2 m m .$ Assuming that the dimples are hemispherical, the total surface area which is exposed to the surroundings is

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cm. Its surface has

150

dimples each of radius

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if both parents have dimples then is it true that the child will definitely have dimples?

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A golf ball has diameter equal to 4.2 cm. Its surface has 200 dimples each of radius 2 mm. Calculate the total surface area which is exposed to the surroundings assuming that the dimples are hemispherical.

Surface area of ball Total surface area exposed

Surface area of ball

Total surface area exposed