If you dont have the radius or the circumference divide the area of the circle by p and then find that numbers square root to get the radius. Then you can just multiply the radius by 2 to find the circles diameter. Finding its center using the midpoint equation Define the length of the radius finding half of the diameter.
P Pi 314159 o Circle diameter.
Formula to find the equation of circle if two endpoints of a diameter are given. In terms of circumference the diameter can be computed using the equation d cpi where c represents the circumference and pi is approximately equivalent to 3142. And so does this calculator. Now Area 20096.