quinquangular

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 pentagram is a symbol of protection and good luck in many cultures.
   五角星在许多文化中是保护和好运的象征。
3. 3.The pentagon is often used in architecture to create a sense of symmetry and balance.
   五边形常被用于建筑中，以创造对称和平衡的感觉。