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
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
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.
如图,AD和BC相交于点O,OA=OD,OB=OC.求证AB平行DC?
已知:如图,AB平行CD,AD与BC相交于点O,且OA=OD.求证OB=OC
已知:如图,直线AD与BC交于点O,OA=OD,OB=OC.求证:AB∥CD.
已知:如图,AB与CD相交于点O,且OA=OD,OB=OC 求证:AD平行CB
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
如图,AD和BC相交于点O,AB∥CD,且OC=OD.求证:OA=OB(要完整的过程)
如图,AC和BD相交于点O,且AB平行DC,OC=OD,求证:OA=OB
如图所示,在梯形ABCD中,AB‖DC,AD=BC,AC与BD交于点O,求证:OA=OB,OD=OC
如图所示,在梯形ABCD中,AB//DC,AD=BC,AC与BD交于点O,求证OA=OB,OD=OC