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已知,如图,AD与BC相交于点O,AB∥CD,如果∠B=20°,∠D=40°,那么∠BOD为( )
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已知如图ADBC相交于点OOA=ODAB∥CD.求证AB=CD.
已知如图AD与BC相交于点O.AB∥CD如果∠B=20°∠D=40°那么∠BOD为
40°
50°
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已知如图10所示把一张矩形纸片ABCD沿BD对折使C.点落在E.处BE与AD相交于点O写出一组相等的
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2对
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如图AB与CD相交于点O.AD∥BCAD∶BC=1∶3AB=10则AO的长是___________.
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4对
如图AC与BD相交于点O.已知AB=CDAD=BC则图中全等的三角形有
1对
2对
3对
4对
已知如右图所示AD与BC相交于点OAB∥CD如果∠B=20°∠D=40°那么∠BOD为.
已知如图AE=BFAD∥BCAD=BCABCD交于O.点求证OE=OF
已知如图AD与BC相交于点O.AB∥CD如果∠B.=20°∠D.=40°那么∠BOD为_______
.已知如图AB∥CDAB=CDADBC相交于点O.BE∥CFBECF分别交AD于点E.F.求证1OA
如图AC与BD相交于点O.已知AB=CDAD=BC则图中全等的三角形有
1对
2对
3对
4对
如图已知AB∥EF∥CDAD与BC相交于点O..1如果CE=3EB=9DF=2求AD的长2如果BOO
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80°18’
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如图AC与BD相交于点O.已知AB=CDAD=BC则图中全等的三角形有
1对
2对
3对
4对
已知如图AD与BC相交于点O.AB∥CD如果∠B=20°∠D=400那么∠BOD为
40°
50°
60°
70°
如图弦AB与CD相交于⊙O.内一点E.过E.作BC的平行线与AD的延长线相交于点P..已知PD=2D
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