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If you know the radius
Given the radius of a circle, the diameter can be calculated using the formula:
The Diameter is Twice the Radius, or D = 2R
Where R is the Radius.
If you know the circumference
If you know the circumference of a circle, the diameter is found using the formula D= C/π
where:
C is the circumference of the circle
π is Pi, approximately 3.142
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