A fifteen-sided figure is also called a pentadecagon. It is a polygon with fifteen sides and fifteen angles. Other synonyms for a fifteen-sided figure include quindecagon, pentakaidecagon, and fifteen-gon. The prefix "quin" and "pent" both mean five in Latin and Greek respectively. Therefore, synonyms such as quindecagon and pentadecagon reflect the number of sides in a fifteen-sided figure. A pentakaidecagon is made up of fifty-eight diagonals, which is the maximum possible number of diagonals of any fifteen-sided figure. The term fifteen-gon is also used to describe a fifteen-sided figure in geometry.