The circumference of a circle with a diameter of 18 yards is: 56.55 yards (diameter x Pi = circumference).
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3.141*18 yd = 56.538 yd Circumference is 2 * pi * r
The area of a circle, if the diameter is 18 yards, is: 254.5 square yards.
The diameter is about 18.
If the diameter of a circle is 18 centimeters the circumference will be about 56.55 cm (d x Pi = C)
The circumference of a circle with an 18-inch diameter is about 56.55 inches. (C = d x Pi)