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如图,在△ABC中,EF∥BC,AB=3AE,若S四边形BCFE=16,则S△ABC=( )
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如图E.F分别为△ABC的边BC.CA的中点延长EF到D使得DF=EF连接DA.DB.AE.1求证四
平行四边形ABCD如右图所示E为AB上的一点FG分别为AC与DEDB的交点若AB=3AE则四边形BE
2∶7
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如图在△ABC中AB=ACD为BC中点四边形ABDE是平行四边形ACDE相交于点O.1求证四边形AD
如图在四边形ABCD中AB∥DCE.是AD中点EF⊥BC于点F.BC=5EF=3.1若AB=DC则四
如图在△ABC中AB=BCBD平分∠ABC四边形ABED是平行四边形DE交BC于点F.连接CE.求证
如图在四边形ABCD中AB∥DCE.是AD中点EF⊥BC于点F.BC=5EF=3.1若AB=DC则四
如图四边形ABCD中∠BAD=∠C.=90°AB=ADAE⊥BC于E若线段AE=5则S四边形ABCD
探究如图①在四边形ABCD中∠BAD=∠BCD=90°AB=ADAE⊥CD于点E.若AE=10求四边
如图在四边形ABCD中∠BAC=90°E.是BC的中点AD∥BCAE∥DCEF⊥CD于点F.1求证四
3.00分如图在△ABC中EF∥BCAB=3AE若S四边形BCFE=16则S△ABC=
16
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如图在平行四边形ABCD中点E.F.分别在CDBC延长线上AE∥BDEF⊥BF.1求证四边形ABDE
如图四边形ABCD是平行四边形BE平分∠ABCCF平分∠BCDBECF交于点G.若使EF=AD那么平
∠ABC=60°
AB:BC=1:4
AB:BC=5:2
AB:BC=5:8
如图四边形ABCD中∠BAD=∠C.=900AB=ADAE⊥BC于E.若线段AE=5则S.四边形AB
如图已知△ABC是等边三角形点D.F.分别在线段BCAB上∠EFB=60°DC=EF.1求证四边形E
如图在△ABC中EF∥BCAB=3AE若S.四边形BCFE=16则S.△ABC=
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1如图①若BC=6AC=4∠C.=60°求△ABC的面积S.△ABC2如图②若BC=aAC=b∠C.
如图四边形ABCD中∠BAD=∠C=90°AB=ADAE⊥BC于E若线段AE=5BE=2则S四边形A
如图在△ABC中D.E分别是AB.AC的中点过点E作EF∥AB交BC于点F.1求证四边形DBFE是平
1如图①若BC=6AC=4∠C.=60°求△ABC的面积S.△ABC2如图②若BC=aAC=b∠C.
如图①在△ABC中AB=AC过AB上一点D.作DE∥AC交BC于点E.以E.为顶点ED为一边作∠DE
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