Question

If the radius of a cylinder is doubled and height remain same find the volume of new cylinder

Answer 1

The new radius is 2r
$the \: new \: volume \: = \pi ({2r)}^{2} h$
$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 4\pi {r}^{2} h$

Answer 2

Hope u will be satisfy with my answer

Suppose the cylinder has a radius=r

A.t.q

If its radius is doubled then new radius will be=2r

Voloume of cylinder =22/7×r^2×h

=> pi×(2r)^2×h

=>pi×4r^2h

=>4pir^2h

Thanks