Circumference = 17*pi
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Divide the diameter by 2.
Diameter = 2 x radius = 34 cm.
diameter times pi(3.14159) equals cicumference
circumference = π x diameter ⇒ diameter = circumference ÷ π = 32 in ÷ π ≈ 10.19 in
If 20 is the diameter, the circumference is 62.8 yards.