How to do you find the radius of a square with a circle inscribed into it?

When used in reference to a square, the radius is the distance from the center of the square to any of the four vertices, or where two sides intersect. Because a square has four right angles, you can find the diameter of the square using the Pythagorean Theorem. Multiply the side length of the square by itself.

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and radius of a circle is 2 pi R the formula your welcome; ) love u