The radius of a cylinder is half the thickness of its circular cross section.
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Pi * Radius * Radius * Height.
The answer will depend on whether the larger cylinder is 4 times larger in terms of radius, cross-sectional area, or volume. If radius, multiply the smaller radius by 4. If cross-sectional area, multiply the smaller radius by 2. If volume, you do not have enough information.
The volume of a cylinder that has a radius of 3cm and a height of 7cm is 197.92cm3
The volume of a cylinder with a height of 1 and a radius of 2.45 is: 18.86 units3
If the volume of the cylinder is 5, then its volume is 5 and its radius doesn't matter.