如图,AB=AC,BD=CD,求证:∠1=∠2.
如图,AB=AC,BD=CD,求证:∠1=∠2.
已知:如图,AB=BD,AC⊥CD,AB=AC.求证:BD=CD
如图,已知AB⊥BD,AC⊥AB,AB=AC,求证:BD=CD
如图,已知AB=CD,AC=BD,求证:(1)∠A=∠D,(2)AE=DE
已知:如图,AB∥CD,AC∥BD,∠1=100°,求证∠2=100°
已知 如图AB=CD AC=BD,求证∠B=∠C
已知:如图,AB=AC,∠ABD=∠ACD,求证:BD=CD
如图,已知AB=CD,AC=BD,求证;∠A=∠D.
如图,在△ABC中,AD平分∠BAC.求证(1):S△ABD:S△ACD=AB:AC;(2)BD:CD=AB:AC
已知:如图AC∥BD,AB∥CD,AE和BE分别平分∠CAB和∠DBA,CD过点E.求证:CD=AC+BD
如图:AB⊥BD,ED⊥BD,AB=CD,AC=CE.求证:AC⊥CE.
如图,已知:AB⊥BD,CD⊥BD,∠1+∠2=180°,求证:CD∥EF