nonagon
🇺🇸
/ˈnɑːnəɡɑːn/
🇬🇧
/ˈnɒnəɡən/
A polygon with nine sides and nine angles.
The nonagon was a challenging shape to draw for the geometry class.
九邊形對於幾何課來說是一個具有挑戰性的形状來繪製。