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A regular one has internal angles of 140 degrees
Answer for the clue "A regular one has internal angles of 140 degrees ", 7 letters:
nonagon
Alternative clues for the word nonagon
Word definitions for nonagon in dictionaries
WordNet
Word definitions in WordNet
n. a nine-sided polygon
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.
Wiktionary
Word definitions in Wiktionary
n. (context geometry English) A polygon with 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 ...