pentagon

In geometry class, we learned how to calculate the sum of the interior angles of a regular pentagon.

(Chinese) 在几何课上，我们学习了如何计算正五边形的内角和。

The shape of the soccer ball's patches is a combination of white hexagons and black pentagons.

(Chinese) 足球贴片的形状是白色六边形和黑色五边形的组合。