Question

A 5m wide cloth is used to make a conical tent of base diameter 14m and height 24m .find the cost of cloth used at the rate of Rs25 per metre

Answer 1

$radius = \frac{14}{2} = 7 \\ l = \sqrt{h {}^{2} + {r }^{2} } \\l = \sqrt{576 + 44} \\ l = \sqrt{625 } \\ l = 25 \\ area \: of \: clothes \: = \pi \: rl \\ \frac{22}{7} \times 7 \times 25 \\ 550 m {}^{2} \\ length \: of \: \: the \: clothes = \frac{550}{5} \\ = 110 \\ cost \: of \: clothes = 110 \times 25 \\ 2750$

Answer 2

May this will help you