有趣的三角形面积定理及应用陕西省武功县教育局教研室马希选三角形的面积问题，时常活跃在数学竞赛中，笔者就此类问题进行了一点初步探讨，整理得到了解决此类问题的一些有趣定理．供大家参考，不妥之处，请批评指正．一、关于三角形中的三角形定理１如图１，Ｄ为ＡＡＢ... Interesting triangle area theorem and application area of ​​the Marxist triangle in the teaching department of the Wugong County Education Bureau in Shaanxi Province are often active in the mathematical competition. The author has conducted a preliminary discussion on such issues and has collated and obtained some interesting theorems for solving such problems. For your reference, it is inappropriate, please criticize and correct me. First, on the triangular triangle theorem 1 as shown in Figure 1, D is AAB...