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The formula for finding the radius of a circle is circumference divided by double of pi. If area is given instead of circumference, the radius may be found by dividing the area by pi, then finding the square root of the resultant quotient. It is also equal to half of the diameter, or the diameter divided by 2.

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10y ago
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13y ago

It depends on what information you have. The formula will be different depending on whether you know the area, the perimeter, the diameter etc.

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Q: What is the formula for finding the radius?
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