Radius is half of the diameter, so.....
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The diameter of any circle is twice its radius. A circle with a radius of 13 inches will have 2 x 13 = 26 inches for a diameter.
It is: 26/2 = 13 inches
A circle 14 inches in diameter has a radius of 7 inches, and a circle having a radius of 7 inches has a diameter of 14 inches.
Radius = Diameter/2 so the radius of a "a" is 4 inches.
Radius is merely..., diameter/2 3 inches/2 = 1.5 inches in radius ==============