Divide the circumference by PI
d=2r.
* * * * *
diameter = 2*sqrt(area/pi)
Basically, the answer depends on what information you do have.
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Diameter = circle's circumference/pi
The diameter of a circle is simply twice the radius of the circle. The radius is a line that starts from the center of the circle to the circumference of the circle. The diameter is a line that passes through the circle. diameter=2xradius
The circumference of a circle is the diameter times pi (3.14)
To get the circumference of a circle first you have to find the diameter of the circle and multiply the diameter by Pi (3.14 in short). so it is the diameter * Pi.
The diameter of a circle is directly proportionate to the circumference. You can find the diameter of a circle by dividing the circumference by the value of Pi (3.14) OR you can find the circumference by multiplying Pi by the diameter. it is a line that halves a circle