中学几何定理繁多,题目求解灵活.通过下面的一道题目,希望能够激发学生主动学习、主动探索的兴趣.而兴趣则是学习的最好老师.在这道题目的巧解与多解当中,涉及到的定理有勾股定理、切割线定理、角平分线定理、射影定理及点到直线的距离、三角函数等知识.包罗了较多的几何定理和代数知识.通过这 There are many middle school geometrical theorems, and the problem is solved flexibly. Through the following topic, we hope to stimulate students’ interest in active learning and active exploration. And interest is the best teacher for learning. In the articulation and multiple solutions of this topic, The theorems include Pythagorean theorem, cutting line theorem, angle bisector theorem, projective theorem, point-to-line distance, trigonometric functions, and so on. It covers more geometric theorems and algebra knowledge.