A polygon is a plane figure made up of three or more line segments which intersect only at their endpoints and in which each endpoint is on exactly two line segments.
The line segments are called the sides of the polygon. Each endpoint is called a vertex of the polygon.
Can you find two points in the interior of this polygon such that the line segment joining them is not entirely in the interior of the polygon?
A regular polygon is a polygon in which all the sides are equal and all the angles are equal. For example, the equilateral triangle is a regular polygon.
More on Regular Polygons
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