The circumference is about 40.84 units.
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Circumference = pi*13 yards
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
If a circle has a diameter of 19, the circumference is: 59.7 (diameter x Pi = circumference)
The circumference of a circle if the diameter is 12cm is 37.7cm