The ancient Greeks, the word derives from a Greek word meaning 'diagonal of a circle'
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diameter is longer. radius is half of diameter
To find area of a circle using diameter, you use this formuler. Area=pi(diameter/2)(diameter/2)
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 16. The radius is half its diameter
The diameter would be 14 cm, since the diameter is twice the radius.