Pentamerus

例句：

1. 1.The pentagon is a five-sided shape with five equal sides.
   五角星是一种有五个相等边长的五边形。
2. 2.The pentagon was the symbol of the Olympic Games.
   五角星是奥林匹克运动会的象征。
3. 3.The pentagon has five equilateral triangles connected at the vertices.
   五角星由五个等边三角形顶点相连。