Question

What length of 5 m wide cloth will be required to make a conical tent, the radius of whose base is 7 m and whose height is 24 m?

Answer 1

$r=7m$

$h=24m$

$l=\sqrt{r^2+h^2}$

$=\sqrt{49+576}$

$=\sqrt{625}$

$=25$m

CSA$=\pi rl$

$=\frac{22}{7}\times 7\times 25=550m^2$

Length of cloth $=\frac{550m^2}{5m}=110m$.