d * pi
or 2 * r * pi
Where d is diameter and r is radius and pi = 3.14159
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circumference=r2pi
There is no circumference of a cone, but, we only do the circumference of the circle. the formula for the circle is pi times D. D= Diameter
Area = (Circumference)2/(4*pi)
The circumference of a circle is two times pi times the radius.
If you are given the radius of the circle, you can use the formula: diameter = 2*radius If you are given the circumference of the circle, you can use the formula: diameter = circumference/pi