A heap of rice is in the form of a cone of base diameter 24 m and height 3.5 m. Find the volume of the rice. How much canvas cloth is required to just cover the heap?

### Answer

Radius of conical heap = 12 m

Volume of rice = 1/3 × π × r^{2} × h

1/3 × 22/7 × 12 × 12 × 3.5 m^{3}

= 528 m^{3}

Area of canvas cloth required = Curved Surface Area of cone = πrl

l = √(12^{2} + 3.5^{2}) = 12.5 m

Area of canvas required = 22/7 × 12 × 12.5

= 471.4 m^{2}