What you would do is just multiply the radius by 2 because radius is 1/2 of the diameter.
Example:
A circle has a radius of 8 cm. What is the diameter?
Just multiply 8 times 2 = 16
The diameter of the circle is 16 cm.
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the radius is half the diameter
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 = Diameter / 2 = 25 cm.
The diameter is twice the radius. So multiply the radius by 2
Diameter = 2*Radius