Question

If a radius of cylinder become half and height become
double then the volume will be.​

Answer 1

Let the radius and height of the cylinder be 14 cm and 20 cm respectively. Therefore, the original volume will be as follows. Therefore, in a cylinder, if the radius is halved and the height is doubled, then the volume will be halved.

Answer 2

volume will be $\frac{\pi rh}{2}$

see the pic that i have attached

hope this helps...