Since the volumes depends on the radius to the 3rd power, we can look at 2r and note that it is 8x larger. For example if we start with radius 2 and make it 4, we note that 23 =8 and 43 =64 which is 8x8.
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The volume becomes eight-fold.
It depends on the shape. The volume of a sphere will increase differently to the volume of a cylinder, for example.
The volume of a sphere with a radius of 13 is: 9,203 units3
The volume of a sphere with a radius of 18 is about 24,429 units3
The volume of a sphere with a radius of 12 is: 7,238.2 cubic units.