What is a pentagon, to reply to the question? Take a look at the reasons that follow. A polygon with five fringes and five vertices is learned as a pentagon. Polygons reach in a variety of forms and dimensions, and they all contain five consecutive lines and five angles and vertices as expected. They could be any measurement, with the exact or various size lines, as extended as the edges all meet to form a secure system. Are you interested in the roots of the term pentagon? The prefix "Penta" is derived from the Greek word "five."