Nine-sided polygon

• Figure a small number continue to badger
• Its internal angles total 1,260 degrees
• A nine-sided polygon
• A regular one has internal angles of 140 degrees
• Defective stop sign?
• Shape of a Bahai temple
• Shape of every Baha'i temple

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"plane figure with nine sides," 1680s, a hybrid from Latin nonus "ninth" (see nones ) + ending from pentagon , etc.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Nonagon \Non"a*gon\, n. [L. nonus ninth + Gr. ? angle.] (Math.) A plane figure or polygon having nine sides and nine angles.

Wikipedia Word definitions in Wikipedia
In geometry , a nonagon (or enneagon ) is a nine-sided polygon or 9-gon. The name "nonagon" is a prefix hybrid formation, from Latin ( nonus , "ninth" + gonon ), used equivalently, attested already in the 16th century in French nonogone and in English from ...