Question

How many metres of cloth $2.5$ m wide will be required to make a conical tent whose radius is $7$ m and height is $24$ m?

Answer 1

R.E.F image

C.S.A. of cone $=$ area of cloth

$\Rightarrow l^2={24}^2+7^2\Rightarrow l=25cm$

$\pi rl=b\times w$

$\Rightarrow \pi \times 7\times 25=2.5\times b$

$\Rightarrow b\simeq 220m$