如图 三角形ABC中,角1=角2,且AB=AC+CD,求证角C=2角B
问题描述:
如图 三角形ABC中,角1=角2,且AB=AC+CD,求证角C=2角B
答
兄弟,图呢..?
答
来图哈
答
∠1=∠2是不是就是AD是∠BAC的角平分线啊证明:在AB上取点E,是AC = AE.连结ED∵AE = AC,∠1 = ∠2,AD = AD∴△AED≌△ACD∴CD = ED,∠C = ∠AED∵AB = AC+CD = AE + EB∴CD = BE∴ED = BE∴∠B = ∠EDB∵∠AED = ∠B...