Question

A hemispherical bowl made of brass has inner diameter 10.5cm.Find the cost of tin-plating it on the inside at the rate of Rs 16 per 100cm^2

Answer 1

d=10.5 cm
r=d/2
r= 10.5/2

C.S.A of hemisphere= 2πr²
2x22/7x10.5/2 x10.5/2
=173.25
cost of painting= Rs 16 per 100cm²

So,
Cost = 16x173.25÷100
16x1.7325
27.25



So cost= Rs 27.25



Thanks