一次八年级数学测试时,其中的一道几何证明题为:已知:△ABC中,AB=AC,D是AB上一点,DE⊥BC,E是垂足,ED的延长线交CA的延长线于点,求证:AD=AF.看到这道题,觉得此题考查的是等腰三角形的性质和判定,可阅卷中发现学生对此题的证明却出乎我的意料,让我兴奋,逼我反思,促我醒悟,大有不吐不 In an eighth-grade math test, one of the geometric proofs is: Known: △ ABC, AB = AC, D is the AB point, DE⊥BC, E is the foot, ED extended line to pay CA extension line At the point, verify: AD = AF. See this question, I think this question examines the nature and determination of the isosceles triangle can be found in the test paper student proof of this question was beyond my expectations, let me excited, Forced me to reflect, urged me to wake up, there is a great vomit not