V = (pi)*R2*H
if you double the radius then put 2R in place of R in the formula:
V = (pi)*(2R)2*H
V = 4pi*R2*H
So the volume will increase 4 fold if you double the cylinder's radius.
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The volume of a circular cylinder varies directly with the height of the cylinder and with the square of the cylinder's radius If the height is halved and the radius is doubled then the volume will be increased.
If the radius and height of a cylinder are both doubled, then its surface area becomes 4 times what it was originally, and its volume becomes 8 times as much.
The volume is doubled.
If the radius of a sphere is doubled, the surface area increases by (2)2 = 4 times, and the volume increases by (2)3 = 8 times.
Two times larger.