Question

Washing tub in the shape of a frustum of a cone has height 21 cm. The radii of the circular top and bottom are 20 cm and 15 cm respectively. What is the capacity of the tub? = (π = 22/7)

Given: For the frustum shaped tub, 

height (h) = 21 cm, 

radii (r₁) = 20 cm, and (r₂) = 15 cm 

To find: Capacity (volume) of the tub.

Answer 1

Volume of frustum = 1/3 πh (r₁² + r₂² + r₁ × r₂)

∴ The capacity of the tub is 20.35 litres.