The radius is half of the diameter. So in this case, the radius is 13/2 or 6.5, or 6 1/2.
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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.
The diameter of a circle is always twice the length of the radius. Therefore, if the radius is 13 centimeters, the diameter would be 2 x 13 = 26 centimeters.
13 mm. The radius of a circle is 1/2 of the diameter.
27 inches
13 in.