Enneadecagon
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Enneadecagon

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In geometry, an enneadecagon is a polygon with 19 sides and angles. It is also known as an enneakaidecagon or a nonadecagon. The word "polygon" derives from the Greek ("many") and (g nia), meaning "knee" or "angle". Today a polygon is more usually understood in terms of sides. Usually two edges meeting at a corner are required to form an angle that is not straight (180°); otherwise, the line segments will be considered parts of a single edge. The basic geometrical no...