The diameter of a circle is the length of a straight line drawn through the center of the circle to its edges.
Or, measure the circumference of the circle and divide by pi (3.14159).
Or you can multiply the radius times two
To get diameter you have to find the radius and then double it to get the diameter
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Take the circumference divided by pi to find the diameter and divide the diameter by two to find the radius.
Diameter=2piR
When you have the radius of a circle and you are trying to find the diameter, multiply the radius by two; the answer is the diameter. If you have the diameter and want to find the radius, divide the diameter by two; the answer will be the radius. The diameter is 54 centimeters.
Circumference = Pi * diameter
the radius is half the diameter