two times the radius (d=2r)
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PI times the DIAMETER
The formula for the circumference of a circle is pi * diameter or (2 radius.)
circumference of a circle = 2*pi*radius or pi*diameter
Assuming you mean a circle, use the formula for the area of a circle, which is usually expressed in terms of the radius, and solve for the radius. Then you can multiply that by two to get the diameter, since the diameter is twice the radius.
If Area of a circle = 2 * pi * rAnd Diameter = 2 * rTherefore:Diameter = 2 * r= Area of circle / piwhere pi = 3.14