Q2 of 52 Page 160

A 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?

Height of frustum, h = 21 cm


Two radii of frustum are, r1 = 20 cm and r2 = 15 cm


As we know,





⇒ V = 20350 cm3


⇒ V = 20.35 litres


∴ Capacity of bucket is 20.35 litres


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