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The volume becomes one eighth.
if its a cone: volume= (1/3) base* height or volume= (1/3) pi *radius*radius[r squared]* height
The volume of a cylinder is (pi)r^2h. This means the volume is dependent on both the height and the radius of the cylinder. So, one must know Volume and either radius or height to calculate height or radius respectively.
(assuming its a cylinder) volume = pi * radius2 * height so: radius = square root ( volume / ( pi * height ) )
If the height is 9 and the volume is 21, then the radius = 0.8618