Circumference = pi*18 = 56.549 feet rounded to 3 dp
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The circumference of a 19 foot diameter circle is: 59.7 feet.
The circumference of a 6 foot diameter circle is: 18.8 feet. (C = d x Pi)
The diameter of a 20 foot circumference circle is about 6.366 feet. (C / Pi = diameter).
diameter = circumference ÷ π = 10 ft ÷ π ≈ 3.18 ft
The circumference of a 4 foot diameter circle may be obtained by multiplying the diameter by pi, which is 3.1416 4 X 3.1416 = 13 (rounded to the nearest whole number)