EnglishEdit
PronunciationEdit
 IPA^{(key)}: /ˌpɛntəˈdɛkəɡən/
NounEdit
pentadecagon (plural pentadecagons)
 a polygon with fifteen sides

 2003: In ⊙ O, draw chord AB equal to r. Draw chord AC equal to Vt (which is the side of a regular decagon). CB is now one side of the regular pentadecagon. — Steven Atiyah, Essentials of Geometry (Trafford 2003, p. 357)
