Question

A hemispherical dome is whitewashed from the inside at rs 308 at the rate of Rs 4 per m^2. find the inner surface area and also the volume.

Answer 1

Answer:

Step-by-step explanation:

the inner surface area of the dome is nothing but the total cost of whitewashing divided by the rate per metre. hence inner surface area= 498.96 / 2 = 249.48 m^2. now, inner surface area = 2πr^2. therefore 2πr^2 = 249.48, which gives r = 6.3 m. so, volume = 2/3*πr^3 = 523.908 m^3.