1. A nonagon has nine sides and nine angles.
一个九边形有九条边和九个角。

2. The flag of Nepal features a nonagon shape.
尼泊尔国旗呈九边形。

3. Can you draw a perfect nonagon freehand?
你能手绘出一个完美的九边形吗？

4. The ancient symbol of the enneagram is a nonagon with connecting lines.
九角形的古代符号是一个带有连接线的九边形。

5. The garden was designed with a central nonagon fountain.
花园设计了一个中央的九边形喷泉。

6. A nonagon can be divided into six triangles.
一个九边形可以被分成六个三角形。