area = pi x r^2 so
area/pi = r^2 so
square root of area/pi = r
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The answer depends on what information you are given: volume and radius or diameter, or surface area and radius, etc.
The answer depends on what information you are given: volume and height, or surface area and height, etc.
Area of circle = pi*(radius)2
Volume = 4/3 * pi * radius * radius * radius Surface Area = 4 * pi * radius * radius
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.