Question

The volume of a metallic cylindrical pipe is 748$c{m}^3$. Its length is 14 cm and its external radius is 9 cm. Find its thickness.

Answer 1

Height = h= 14 cm

Radius = rcm

Given,

Volume = 748 $c{m}^3$

$\pi r^{2}h=748$

$\frac{22}{7}\times r^2\times h=748$

$r^2=\left(\frac{748\times 7}{22}\right)\left(\frac{1}{14}\right)$

$r^2=17$

$r=\sqrt{17}$

$\approx 4.$

external radius$=9cm$ (given)

Thickness of pipe$=9-4=5cm$