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Wikipedia definition
1. EnneadecagonIn geometry, an enneadecagon is a polygon with 19 sides and angles. It is also known as an enneakaidecagon or a nonadecagon. The radius of the circumcircle of the regular enneadecagon with side length t is (angle in degrees) The area of a regular enneadecagon, where t is the edge length, is
Read “Enneadecagon” on English Wikipedia
Read “十九角形” on Japanese Wikipedia
Read “Enneadecagon” on DBpedia

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