It is quadrupled.
volume_cylinder = π x radius2 x height
If radius → 2 x radius then:
new_volume = π x (2 x radius)2 x height
= π x 22 x radius2 x height
= 4 x π x radius2 x height
= 4 x original_volume
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The volume will be doubled.
4
volume=pi*radius squared*height/3, where radius is the radius of the cylinder (and will be the radius of the base of the cone),and height is the lenth of the cylinder.
Doubling the radius quadruples the volume.
The volume of a cylinder that has a radius of 6 and a height of 8 is: 226.2 units3