△ABC中∠ABC=50°∠ACB=80°延长CB至D使DB=BA,延长BC至E,使CE=CA.连接AD,AE.求∠D,

学习时间:2026-04-01 06:36:55 阅读：5905

△ABC中∠ABC=50°∠ACB=80°延长CB至D使DB=BA,延长BC至E,使CE=CA.连接AD,AE.求∠D,∠E,∠DAE的度数如图,△ABC中,∠ABC=50°,∠ACB=80°,延长CB至D,使DB=BA,延长BC至E,使CE=CA.连接AD,AE.求∠D,∠E,∠DAE的度数

贪玩的帆布鞋

2026-04-01 06:36:55



因为,AB=BD,∠ABC=50°所以,∠D=∠BAD= (1/2)*∠ABC = 25°同理,∠E=∠CAE= (1/2)*∠ACB = 40°所以,∠DAE=180°-∠D-∠E = 180°-25°-40°=115°