To be able to find the radius of the cylinder, you need to know not only its volume but also its height. The best we can do is find an expression for the radius in terms of the height of the cylinder
volume of cylinder = Pi x r2 x h
where r is the radius of the cylinder and h is the height of the cylinder
980 = Pi x r2 x h
r = square root(980/(Pi x h))
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The volume of a cylinder that is 980 in long and has a radius of 7 inches is: 150,900 cubic inches.
If the volume of the cylinder is 5, then its volume is 5 and its radius doesn't matter.
The volume of a cylinder that has a radius of 3cm and a height of 7cm is 197.92cm3
Pi * Radius * Radius * 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.