pi times the diammeter 3.14159 x diameter
Dan's answer:
circumference= pi X diameter.
2pi X Radius=Pi X Radius (x2)
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If you know the circumference of a circle, you can find the radius by dividing the circumference by the value of Pi (3.14159...)
Diameter of a circle = circumference/pi
to find the circumference of any circle, times the diameter(d) by pi and you will get the answers.
circumference is π*d. In this case it is 8π feet ≈ 8 * 3.1416 ≈ 25.1327 feet■
circumference = 2πr = 2π x 6 = 12π units