triskaidecagonal
Triskaidecagonal refers to a polygon with thirteen sides. The word itself is derived from the Greek word "treiskaideka" meaning thirteen, and "gonia" meaning angle or corner. A triskaidecagon is therefore a thirteen-sided polygon. Like any polygon, it is a closed two-dimensional shape made up of straight line segments.
A regular triskaidecagon has thirteen equal sides and thirteen equal interior angles. The measure of each interior
While less commonly encountered in everyday geometry than shapes like triangles or squares, triskaidecagons do appear