如图,已知AD交BC于点O,OA=OD,∠B+∠C=180°,求证AB=CD
如图,已知AD交BC于点O,OA=OD,∠B+∠C=180°,求证AB=CD
如图,已知AD、BC交与点O,AB∥CD,OA=OD,求证:AB=CD
已知,如图,AC,BD交于O点,且OA=OC,OB=OD.求证:AB平行CD,AD平行BC.
已知:如图,直线AD与BC交于点O,OA=OD,OB=OC.求证:AB∥CD.
如图,AD、BC相交于点O,OA=OD,AB//CD.求证:AB=CD
如图AD,BC相交于点O,且OA=OC,OB=OD EF过点O分别交AB,CD于点E,F且∠AOE=∠COF.求证OE=
已知:如图,AC和BD交于点O,AB//CD,OA=OB 求证OC=OD
已知:如图,AB平行CD,AD与BC相交于点O,且OA=OD.求证OB=OC
如图,AB=CD,AE⊥BC于E,DF⊥BC于F,AD交EF于O,OA=OD,求证:BF=CE
已知:如图ab平行于cd,ab等于dc,ad与bc交于o点,求证:oa=od,ob=oc
如图,AD和BC相交于点O,OA=OD,OB=OC.求证AB平行DC?
如图,已知AB,cD相交于点O,且AB=cD,AD=CB,求证OB=OD