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如图，BE与CD相交于点O，已知AD=AE，∠ADC=∠AEB．找出图中相等的线段、相等的角．
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已知如图ADBC相交于点OOA=ODAB∥CD.求证AB=CD.
如图已知在△ABC中点D.E.分别在ABAC上且AD·AB=AE·ACCD与BE相交于点O..1求证
如图BE与CD相交于点O已知AD=AE∠ADC=∠AEB．求证OB=OC．
如图已知AB是⊙O.的直径弦CD⊥AB垂足为H..1求证AH•AB＝AC22若过A.的直线与弦CD不
如图D.E.分别是AB.AC上两点CD与BE相交于点O.下列条件中不能使ΔABE和ΔACD相似的是
∠
=∠C B. ∠ADC=∠AEB
BE=CD，AB=AC
AD∶AC=AE∶AB
如图已知线段AB.CD相交于点OAD.CB的延长线交于点EOA=OCEA=EC请说明∠A=∠C.
如图在四边形ABCD中AC与BD相交于O点∠ADC=∠BAD=90°△COD的面积为1.5且CD=3
4
3
6
7.5
如图已知线段ABCD相交于点O.ADCB的延长线交于点E.OA=OCEA=EC请说明∠A=∠C.
如图点D.在AB上点E.在AC上CD于BE相交于点O且AD=AEAB=AC则判定△ADC与△AEB全
SSS
SAS
ASA
AAS
如图已知直线ABCD相交于点O.OA平分∠EOC∠EOC=700则∠BOD的度数等于_______.
如图已知⊙O的直径AB与弦CD相交于点E.AB⊥CD⊙O的切线BF与弦AD的延长线相交于点F.1求证
如图在菱形ABCD中对角线AC与BD相交于点O.OE⊥AB垂足为E.若∠ADC=130°则∠AOE的
75°
65°
55°
50°
如图⊙O.的直径AB和弦CD相交于点E.已知AE=6㎝EB=2㎝∠CEB=30°则弦CD的长是㎝
已知如图AC和BD相交于点OOA=OCOB=OD求证AB∥CD.
已知如图在▱ABCD中∠ADC∠DAB的平分线DFAE分别与线段BC相交于点F.E.DF与AE相交于
如图已知直线AB和CD相交于O.点射线OE⊥AB于O.射线OF⊥CD于O.且∠BOF=25°.求∠A
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
如图已知⊙O的直径AB与弦CD相交于点E.AB⊥CD⊙O的切线BF与弦AD的延长线相交于点F.1求证
如图已知直线ABCDEF相交于点O.AB⊥CD∠DOE=127°则∠COE=°∠AOF=°
已知如图点P.是⊙O.外的一点PB与⊙O.相交于点A.B.PD与⊙O.相交于C.D.AB=CD.求证
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