A hemispherical bowl made of brass has inner diameter 10.5 cm. Find th

1.	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.
Answer» 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 = \(\frac{4}{100}\times\)173.25 = Rs. 6.93

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.

Answer»

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 = \(\frac{4}{100}\times\)173.25

= Rs. 6.93