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 × r2 × h

1/3 × 22/7 × 12 × 12 × 3.5 m3

= 528 m3

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

l = √(122 + 3.52) = 12.5 m

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

= 471.4 m2

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