A heap of wheat is in the form of a cone of diameter 9 m and height 3.5 m. Find its volume. How much canvas cloth is required to just cover the heap? (Use π =3.14)
We have,
r adius = 9/2 = 4.5 m
height = 3.5 m
∴slant height l =
=
= 5.70 m
∴ Volume of the heap =
= 
×3.14×(4.5)2×3.5 = 74.1825 m3
Area of canvas required = πrl
= 3.14×4.5×5.7 m2 = 80.54 m2
9