13 is a number: numbers have no dimensions and so no diameter.
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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.
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 area of a circle with a diameter of 13 centimeters is: 132.7 cm2
The circumference of a circle with a diameter of 13 mm is: 40.84 mm
The area of a circle with a 13 ft diameter is: 132.7 square feet.