Formula for finding the radius of a circle?

Answer 1

1. The radius of a circle is half of its diameter.

2. The radius can also be calculated from its circumference (C).

Method: Divide the circumference by Pi, this will give you the diameter. Then divide the diameter by 2 to get the radius (r).

Formula: r = C/2Ï€

3. The radius can also be calculated from the area of the circle. Area = π x r2

So, divide area by Pi, then the radius will be the square root of the answer.

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Answer 2

Diameter divided by 2 = radius