Quindecagon is a polygon with 15 sides. There are several synonyms for this word, including fifteen-gon, pentadecagon, and quindecapentagon. Other less commonly used synonyms for quindecagon include tetracontatetragon, oxdecalogon, and pentakaidecagon. In geometry, a polygon is a two-dimensional shape with straight sides, and the quindecagon is a unique polygon due to its fifteen sides. While it may not be a commonly used word in everyday language, it is an important term in mathematics and geometry. Understanding synonyms for quindecagon can improve one's mathematical vocabulary and better facilitate communication when discussing polygonal shapes.