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如图5-1-25,OA⊥OC,OB⊥OD.(1)图中有 个锐角,分别是 ;(2)若∠AOB=120°,求∠DOC的大小.
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如图已知OB⊥ODOA⊥OC那么∠1与∠2相等吗若相等请说明理由.
如图2OA=OCOB=OD则图中全等三角形共有
2对
3对
4对
5对
如图OA=OCOB=OD且OA⊥OBOC⊥OD下列结论①△AOD≌△COB②CD=AB③∠CDA=∠
①②
①②③
①③
②③
.四边形ABCD是任意四边形AC与BD交点O..求证AC+BD>AB+BC+CD+DA.证明在△OA
如图AC和BD相交于点O.且AB∥DCOA=OB.求证OC=OD.
如图AC和BD相交于点OOA=OCOB=OD.求证DC∥AB.
如图已知OA⊥OB∠1与∠2互补求证OC⊥OD.
如图OP是∠AOC和∠BOD的平分线OA=OCOB=OD1图中∠1=∠2吗试说明理由.2AB=CD吗
如图AC和BD相交于点OOA=OCOB=OD.求证DC∥AB.
已知如图OP是∠AOC和∠BOD的平分线OA=OCOB=OD.求证AB=CD.
已知如图AB与CD相交于点O.AC∥BD且AO=OC.求证OB=OD.
如图OAOB是⊙O的半径OA⊥OBC为OB延长线上一点CD切⊙O于点DE为AD与OC的交点连接OD
如图OA=OCOB=OD则图中全等三角形有
2对
3对
4对
5对
已知如图OP是∠AOC和∠BOD的平分线OA=OCOB=OD.求证AB=CD.
如图AC和BD相交于点O.OA=OCOB=OD.求证DC∥AB.
如图已知∠AOB=90°射线OC绕点O.从OA位置开始以每秒4°的速度顺时针方向旋转同时射线OD绕点
已知如图AC和BD相交于点OOA=OCOB=OD求证AB∥CD.
如图OA⊥OBOC⊥OD∠BOC=28°求∠AOD的度数
如图已知OA=OB点C.在OA上点D.在OB上OC=ODAD与BC相交于点E.那么图中全等的三角形共
如图OAOB是⊙O的半径OA⊥OBC为OB延长线上一点CD切⊙O于点DE为AD与OC的交点连接OD
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