By dividing the circumference by 2*pi will give you the radius and twice the radius gives you the diameter.
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to find the diameter of a circle when you only have the circomference you: divide the circomference by pi (approx. 3.14)
Pi X D = Circumference. To find Diamater if you know Circumference, divide Circumference by Pi (3.14).
To find the circumference of a circle you multiply pi, usually rounded to 3.12, by the radius. The formula for the circumference of a circle is 2*pi*radius. So double your radius, then multiply by pi, which is approximately 3.14159265 So if I had a circle of radius 2, my circumference would be 2*3.14*2 = 12.56 Good Luck!
If you know the diameter and need the circumference you times the diameter of the circle by 3.14 also known as pie. That is how you get the circumference by only knowing the diameter. :)
Divide the known circumference by pi to find the diameter of the circle.