It's probably easier to measure the diameter, i.e., the distance across. Measure that, and divide by 2.
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The radius is half the diameter.
That will depend on its height which has not been given but the volume of a cylinder is pi*radius squared*height.
It depends on the values you have. The base of a cylinder is a circle. If you know the circle's diameter, half it to find the radius. If you know the circle's circumference, divide by 2pi to find the radius. If you know the circle's area, divide by pi and take the square root to find the radius.
The radius of the cylinder would be 0.64cm ! The radius is half the diameter - length has nothing to do with the question !
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))