如图,如图2-19所示,已知∠A=∠DBE,∠ABC=∠EDB,AC=BE
如图,如图2-19所示,已知∠A=∠DBE,∠ABC=∠EDB,AC=BE
日期:2009-10-08 19:45:32 人气:3
证:∵∠A=∠DBE
∠ABC=∠EDB
AC=BE
∴△ABC≌△BDE(AAS)
∴AB=BD ∠C=∠DEB
∴△ADO∽△EOB
∴ ∠A=∠ADB
∴ ∠A+∠ABC+ ∠C= ∠ADB+ ∠EDB+ ∠CDE=180°
∴ ∠C=∠CDE
∴ ∠C=∠EBC
∴AC‖BE