A polygon is a flat shape formed by three or more straight lines that join at points called vertices.
The resulting line segments are known as sides. The word polygon is a compound word of Greek origin.
It is formed by poly, which means many, and gon, meaning angle. So it is a flat shape with many angles.
Elements of a regular polygon:
• Centre (O): the interior point that is the same distance from all of the vertices. It is the centre of the circumscribed and inscribed circumferences of the polygon.
• Vertex (V): the point where two adjacent sides meet.
• Side (s): one of the segments that form the polygon.
• Radius (r): a segment that connects a vertex to the centre of the polygon.
• Apothem (a): a segment that connects the centre to the midpoint of each side.
• Diagonal (D): a segment that connects two non-consecutive vertices of a polygon.
