Is there a formula for calculating the radius of a circle?
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If you know the cirucmference, you can also get the radius. Cirucmference equals 2 times Pi times radius. If the circumference is 18Pi then the radius can be found by taking 18Pi = 2(Pi)r. Divide the equation by 2Pi to get 9 =r, therefore the radius is 9.
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If you are provided with the area of the circle, divide it by 'Pi' that is 22/7 and you will get the square of the radius from where you can get the radius by doing the square root.
If you are provided with the circumference of the circle, divide it by twice 'Pi' that is 44/7 and you will get the radius.
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