> What is a 9, 11, 12, 13, 14, and 15-sided figure called? > > After octagon (8-sided), I'm at a loss. > > Post or E-mail reply, > > Thanks. >
The proper terms are
enneagon, hendecagon, dodecagon, triskaidecagon, tetrakaidecagon, and pentekaidecagon, froming by combining the Greek names for the corrsponding numbers with "gon", meaning "angle", which is a shortened form of the Greek word "gonu", meaning "knee". It's a nice fact that the Greek, Latin, French, German, and English words for knee, namely gonu genu genu Knee knee , are all essentially the same. However the pronunciation has changed, the initial hard g of the Greek and Latin forms becoming soft g in French, and hard k in German and English, and the n being no longer pronounced in English.