RD Sharma - Mathematics

Book: RD Sharma - Mathematics

Chapter: 21. Surface Area and Volume of a Sphere

Subject: Mathematics - Class 9th

Q. No. 5 of Exercise 21.1

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5

A hemispherical bowl made of brass has inner diameter 10.5 cm. Find the cost of the plating it on the inside at the rate of Rs. 4 per 100 cm2.

Surface area of a hemisphere = 2πr2


Given, diameter of the hemisphere bowl is 10.5 cm


Surface area of the bowl = 2 × (22/7) × (10.5/2)2 = 173.25 cm2


Given, cost of the plating it on the inside at the rate of Rs. 4 per 100 cm2


Cost of plating the hemisphere bowl


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