multiply by 2 then times pie
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Multiply the radius by 2 x pi.
Circumference = 2 pi x radius = 6 pi = 18.85 m (rounded)
Divide the circumference by 2PI to find the radius. ( C = 2PI*Radius)
the circumference is two times the radius, or 2r. so if the radius was 3, the circumference would be 6. if the radius was 4, the circumference is 8.