Verified answer

If r be the radius and h be the height, then volume = πr²h

If radius is doubled and height remain same,

the volume will be = π(2r)²2h=

=4πr²h= 4× Volume

The volume is four times more than the original volume.

Let the height be h and radius be r.

Therefore, curved surface area = 2πrh

Now, the radius is doubled. So, the new radius

r′ =2r

New curved surface area =2πr′h

=2π×2r×h

=2×2πrh

=2(Curved surface area of old cylinder)

solved .....

Answer:

the volume becomes 4 times of its

and the curve surface area becomes double of its.