diameter is longer. radius is half of diameter
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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.
Radius = 1/2 of diameter
The diameter is double the radius.
The radius is 1/2 of the diameter, so if the radius is 20 units then the diameter is 40 units. You multiply the radius by 2 to get the diameter.