Question

A dome of a building in the form of hemisphere from inside it was wte washed at the cost of rs 498.96 if the cost of wte wasng is rs 2 per sq.m then find the inside radius of the dome and volume of the air inside the dome

Answer 1

Given that it is in the form of a hemisphere
Now CSA of hemisphere = 2pi r square
Also cost per metre square is rs 2
Total cost = 498.96
Therefore 2 × 2pi × r sqaure = 498.96
88/7 × r square = 498.96
r Square = 49896 × 7/8800
r square = 39.69
r = 6.3 m

Hope it will help you.