A Circle area. Watch this tutorial to see how its done. Area of a circle diameter.
Then multiply by 2 to get the diameter.
If the area of the circle is given the formula d sqrt 4api can also be used to solve for the diameter where a denotes the area. A C2 4p. A p x o 2 2. The diameter of a circle is the length of a straight line drawn between two points on a circle where the line also passes through the centre of a circle or any two points on the circle as.