what is octagon

An octagon is a polygon with eight sides and eight angles. It has eight vertices and eight edges that are joined end to end to form a closed geometric shape. A regular octagon has all its sides equal in length and all its angles equal in measure. The sum of the interior angles of a regular octagon is 1080°, and the sum of the exterior angles is 360° . The interior angle at each vertex of a regular octagon is 135° . An octagon can be constructed using a straightedge and a compass. The word "octagon" comes from the Greek words "okta" meaning "eight" and "gon" meaning "side" or "angle".