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d = 2r, where d is diameter and r is radius.

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Q: What is the radius of a circle which has a three inch diameter?
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Related questions

What is the radius of a circle with a 12 inch diameter?

A circle with a 12 inch diameter has a 6 inch radius.


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The radius of a circle is half the diameter, so the radius of a 6 inch diameter circle is 3 in.


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