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A golf ball has a diameter equal to 4.1cm. Its surface has 150 dimples each of radius 2mm. Calculate the total surface area which is exposed to the surroundings assuming that the dimples are hemispherical.
(Ans: 71.68)
Ans: SA of ball = 4π × ( 4.1/2 )2 = 16.8 π cm2
TSA exposed to surroundings
= SA of ball - 150 × π r2 + 150 × 2π r2
= 16.8 π + 150 π r2
= 71. 68 cm2
A two-digit number is seven times the sum of its digits. The number formed by reversing the digits is 18 less than the original number. Find the original number.
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