3.141*18 yd = 56.538 yd Circumference is 2 * pi * r
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The circumference of a circle with a diameter of 18 yards is: 56.55 yards (diameter x Pi = circumference).
Circumference of circle: 7.4 times pi in yards
Circumference = pi*13 yards
Circumference = (pi) x (diameter) = 10 pi = 31.416 yards (rounded)
The equation for a circle is PiD. The diameter is double the radius, so it is 7 yards in this case. The circumference is 7*PI. Which is approximately 21.98.