A convex polygon is said
to be
regular if all its sides are equal and all angles are equal.
If all the vertices of a polygon lie on a certain circle, then the polygon is called
inscribed in the circle.
If all sides of a polygon are tangent to a certain circle, then the polygon is called
circumscribed around the circle.
The circumscribed and inscribed circles of a regular polygon have the same center, which is called the
center of the polygon. The central angle of a regular polygon is the angle at which the side from its center is visible.
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