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三角形内角和定理在初中几何中占有重要的位置,它的其中的一个推论更是起着举足重轻的作用。今天要说的这个推论的内容是:三角形的一个外角等于与它不相邻的两个内角的和。
The triangle internal angle and theorem play an important role in the geometry of junior high school, and one of its inferences plays a more important role. The reason for this inference today is that an outer angle of a triangle is equal to the sum of the two inner angles that are not adjacent to it.