How to work out the radius of a cylinder when given the volume?

I need help answering this question and i need the correct method as i think that the one i am using is wrong as it keeps giving me an incorrect final answer.

This is the question:
The radius of a cylinder is r cm. The height (or length) of the cylinder is 10 cm. The volume of the cylinder is 140 cm (cubed). Work out the value of r.

How would i go about answering this?

If you can, please give the answer correct to 3 significant figures as well.
Thanks in advance.

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