The dome of a building is in the form of a hemisphere. Its radius is 6

1.	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.
Answer» 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.

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.

Answer»

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.