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How to work out a circle's radius: Easy way of working it out

Updated on June 26, 2012

What is a circle's radius?

A circle's radius is the measurement from the center point of a circle to the outer perimeter. For the easiest way to work out a circle's radius you will need to know what the circle's diameter is.

Working out the radius from the diameter

The formula is as follows:

D/2

Very simple. If you need a further explanation however, all this means is that you divide the diameter by 2 - or in other words, half the length of the diameter.

Test the formula


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