pentangular

例句：

1. 1. The pentagon is a shape with five sides and five angles.
   五边形是一种有五个边和五个角的形状。
2. 2. The pentagon is used in various architectural designs.
   五边形在各种建筑设计中都有使用。
3. 3.The pentagon is often used as a symbol of symmetry and balance.
   五边形常被用作对称和平衡的象征。