Question

A hemispherical bowl made of brass has inner diameter 10.5 cm. Find the cost of
tin-plating it on the inside at the rate of 16 per 100 cm².​

Answer 1

Answer:

D = 10.5cm

r = d = 10.5 = 5.25

2 2

Curved surface area of hemisphere =

2πr² = 2πr( 5.25 )² = 173.25cm²

cost of tin plating 100cm² = 16Rs

Cost of tin plating 1cm² = 16 Rs

100

Cost of tin plating 173.25cm² = 16 ×

100

173.25 = 27.72Rs

Cost of tin plating = 27.72Rs