Question

How much cloth 2.5 m wide will be required to make a conical tent having base redius 7 m and height 24 m ?

(a) 120 m (b) 180 m (c) 220 m (d) 550 m

Answer 1

Considering 24m as the slant height...
The area required to make the conical tent is: pi x r x l
which is = pi x 7 x 24
= 168 pi
And so area of rectangular cloth is 168 pi
so the length required= 168 pi/ 2.5
= 211m (3sf)