to determine the radius if you only have the diameter, you divided the diameter by 2. then there you have it ! you have the radius !
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The radius is half the diameter.
The radius of a circle is half of the diameter, so if the diameter is 56cm the radius can only be 28cm.
Multipy by 2 for the diameter
Easy. First, double the radius to get the diameter. Next, multiply the diameter by Pi (about 3.1416) to determine the circumference.
Radius = Diameter/2 Diameter = 2* Radius