你对三角形了解多少?

作者：吴静

来源：疯狂英语(双语世界), 2019, (01): 61-64.

<正>You may often see triangles.But how much do you know about triangles?你可能经常看到三角形。但是你对三角形有多少了解呢?You can strengthen a square shape by putting a diagonal across it. Then you’ll have 2 triangles.你可以在一个正方形上加一条对角线来加固它。这样,你就会得到两个三角形。