Question

A 5m wide cloth is used to make a conical tent of base diameter 14m and height 24 m. Find the cost of cloth used at the rate of rs. 25 per metre

Answer 1

length of cloth-5m
d of cone -14m
r of cone -7 m
CSA of cone-1/3 pie r square
$1 \div 3 \times 22 \div 7 \times 7 \times 7 =$
$51.4 {m}^{2}$

cost of cloth-
$51.4 \times 25 {m}^{2}$
$= 1285 \: rupees$