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How to find the Diameter of a circle
The Diameter can be found by the following formulas
If you know the radius:
The diameter can be calculated using the formula.
Diameter = 2R or d = 2 x radius
If you know the circumference of a circle, the diameter
can be found using the formula.
C  is the circumference of the circle and π  is Pi,
approximately
3.142
If you know the area, the diameter can be found using the
formula.

A  is the area of the circle. And π  is Pi, approximately 3.142
Remember: The  radius is half of the diameter of a circle
the diameter of a circle
The diameter is the longest distance from one end of a circle
to the other; it is twice the radius.
video
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R  is for the radius  of the circle.
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