1. a polygon with nine sides and nine angles
Usage: geometry

Examples

• The students learned to identify a nonagon by counting its nine sides.
• A regular nonagon has all sides and angles equal.
• The architect incorporated a nonagon shape into the building’s design.
• Drawing a perfect nonagon requires careful measurement of each angle.
• The nonagon is less common than triangles, squares, and pentagons in everyday geometry.
• Each interior angle of a regular nonagon measures 140 degrees.