Circumference of a circle is found by multiplying the diameter by pi (for general use pi is 3.14).
13 x 3.14 = 40.82 feet
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Circumference = pi*13 yards
The circumference is about 40.84 units.
The circumference of a 13-foot diameter circle is: ~40.84 ft
2 x 13 x pi = 81.68 Circumference of a circle = 2*pi*radius or pi*diameter Circumference = 2*pi*13 = 81.68140899
Well, darling, if the circumference of a circle is 13 inches, then the diameter would be approximately 4.14 inches. You can find this by dividing the circumference by pi (3.14). So grab a measuring tape and get to work, honey!