Jisho

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Noun
1. monogon; henagonGeometry
Wikipedia definition
2. HenagonIn geometry a henagon (or monogon) is a polygon with one edge and one vertex. It has Schläfli symbol {1}. Since a henagon has only one side and only one interior angle, every henagon is regular by definition.
Read “Henagon” on English Wikipedia
Read “一角形” on Japanese Wikipedia
Read “Henagon” on DBpedia
Other forms
一角形 【いっかっけい】

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