A nonagon, sometimes known as an enneagon, is a nine-sided polygon. The name is derived in part from the Latin word “nonus,” which means “ninth.”
In comparison to other polygons such as hexagons and octagons, a nonagon is a rare polygon. A regular nonagon is a shape with the same length on all nine sides, implying that all interior angles are equal at 140 degrees. A nonagon contains nine vertices and 27 potential diagonals that can be drawn from vertex to vertex in addition to nine sides. The eight-sided octagon, which resembles a stop sign, and the 10-sided decagon are the most closely related polygons.
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