How Many Sides Does A Nonagon Have?

Skip to content Home › How Many Sides Does a Nonagon Have? By Staff WriterLast Updated May 19, 2025 Follow Us: Facebook Twitter

A nonagon, also called an enneagon, is a polygon with nine sides. The name comes partially from the Latin word for ninth, “nonus.”

A nonagon is an uncommon polygon compared to other polygons like hexagons or octagons. A regular nonagon is a shape where all nine sides are the same length, which consequently means that all internal angles are equal at 140 degrees. Along with nine sides, a nonagon has nine vertices and 27 possible diagonals that can be drawn from vertex to vertex. The most closely related polygons are the eight-sided octagon, like a stop sign, and the 10-sided decagon.

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