June 26, 2019

A polygon is circumscribed in a circle, if its vertices are outside the circle and its sides are tangent to the circle.

The circumscribed polygon intersects at the midpoint of each side to the inscribed circle.

The center of the inscribed circle is equidistant from all sides of the circumscribed polygon.

The apothem the circumscribed polygon is the radius of the inscribed circle.

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