The dome of a building is in the form of a hemisphere. Its radius is 63 dm. Find the cost of painting it at the rate of Rs. 2 per sq m.
Radius of hemispherical dome = 63 dm or 6.3 m
Inner surface area of dome = 2πr2
= 2 x 3.14 x (6.3)2
= 249.48
So, Inner surface area of dome is 249.48 m2
Cost of painting 1m2 = Rs.2
Therefore, cost of painting 249.48 m2= Rs. (249.48 x 2)
= Rs.498.96.
