Reil's triangle

例句：

1. 1. The Reil's triangle is a geometric figure that helps us understand the relationship between angles and sides in a triangle.
   雷利三角形是一种几何图形，它帮助我们理解三角形中角和边之间的关系。
2. 2.In mathematics, the Reil's triangle is used to find the area of a triangle when one side is given.
   在数学中，雷利三角形被用来求已知一边的三角形面积。
3. 3. The Reil's triangle is also known as the Reil's figure of three sides, which is a useful tool for calculating the perimeter ofa triangle.
   雷利三角形也被称为雷利三角形的三条边图，它是计算三角形周长的一个有用的工具。