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20 millimeters

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Q: If the diameter of a circle is 40 millimeters what is the length of the radius?
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What would be the radius of a circle with a diameter of 8 inches?

Radius is one-half of the diameter of a circle. Therefore, the radius of an eight-inch diameter circle is four inches. The diameter of a circle is a straight line joining a point on the circumference through the centre to the 'opposite' point on the circumference.


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