Radius: 45/2 = 22.5mm
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The length of a radius is not the length of a diameter. The diameter is two times the length of the radius.
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.
diameter is longer. radius is half of diameter
Radius = 1/2 of diameter
The diameter is double the radius.