It could be any positive number of centimeters. The volume depends not only on the radius, but also on the height of the cylinder.
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Volume is 1,005.3 cm3
(V = Pi*r2h): A cylinder with a radius of 3 cm and a height of 20 cm has a volume of 565.49 cm3
It is not possible to answer the question with the information provided. Consider 512 cm3 of putty. Make a squat cylinder from it. Measure its height and radius. Then roll it out into a longer cylinder. Measure its height and radius again. Roll it into a still longer cylinder and measure its height and radius yet again. Repeat until you get fed up! All these cylindershave the same volume (512 cm3) because they are made from the same amount of putty. But any one of the height and radius combinations will give that volume.
The volume is 20.58 cm3
7 cm * 7 cm * 3.14 * 15 cm = 2307.9 cm3