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已知:如图,平行四边形ABCD,对角线AC与BD相交于点E,点G为AD的中点,连接CG,CG的延长线交BA的延长线于点F,连接FD. (1)求证:AB=AF; (2)若AG=AB,∠BCD=12...
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已知平行四边形ABCD的对角线AC和BD相交于点O如果△ABC的面积是4那么平行四边形ABCD的面
8
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6
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在平行四边形ABCD中对角线AC和BD相交于点O.则下面条件能判定平行四边形ABCD是矩形的是
AC⊥BD
AC=BD
AC=BD且AC⊥BD
AB=AD
如图平行四边形ABCD的对角线ACBD交于点O.E.F在AC上G.H在BD上且AF=CEBH=DG.
如图所示已知平行四边形ABCD对角线ACBD相交于点O.∠BAO=∠DAO.1求证平行四边形ABCD
已知平行四边形ABCD对角线ACBD交于点O.1若AB=BC则平行四边形ABCD是_________
如图在平行四边形ABCD中对角线AC.BD相交于点O.F.E.是对角线AC上的两点当E.F.满足下列
OE=OF
DE=BF
∠ADE=∠CBF
∠ABE =∠CDF
如图平行四边形ABCD的两条对角线AC与BD相交于点O.且AC⊥AB已知AC=10BD=26那么平行
平行四边形ABCD中对角线AC与BD相交于OEF是AC上的两点并且AE=CE.求证四边形BFDE是
四边形ABCD中ACBD为对角线ACBD相交于点O.BO=4CO=6当AO=______DO=___
已知如图在四边形ABCD中AB∥CD对角线ACBD相交于点OBO=DO.求证四边形ABCD是平行四边
已知四边形ABCD是平行四边形对角线AC与BD相交于点O.那么下列结论中正确的是
)当AB=BC时,四边形ABCD是矩形; (
)当AC⊥BD时,四边形ABCD是矩形; (
)当OA=OB时,四边形ABCD是矩形; (
)当∠ABD=∠CBD时,四边形ABCD是矩形.
如图在四边形ABCD中对角线AC.BD相交于点O.若AO=CO=BO=DOAC⊥BD则四边形ABCD
平行四边形
矩形
菱形
正方形
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