The formula for the circumference (C) of a circle is C = 2πr or C = πD, where r is the radius and D is the diameter.
If you know the circumference then C/π = D
So just divide the circumference by pi to get the diameter.
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Circumference equals pi times the diameter, so you would divide by pi. (3.14159265...)
Divide the circumference by pi, and that will give you the diameter.
Multiply the diameter by pi (approximately 3.1416) to find the circumference.
Well the formula for that problem is C=Pi*d or circumference= 3.14 times the diameter. Figure it out from there.
The radius of a circle is from the middle to the edge, or half the diameter. The circumference is like the perimeter of the circle, and the formula is pi times the diameter.