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如图,A、B、C、D是⊙O上的四个点,=,∠AOB=58°,则∠BDC的度数是( )
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平面内有四个点A.O.B.C.其中∠AOB=120°∠ACB=60°AO=BO=2则满足题意的OC长
如图∠AOB=30°点P.是∠AOB内的一个定点OP=20cm点C.D.分别是O
OB上的动点,连结CP、DP、CD,则△CPD周长的最小值为( )
A.10cm
15cm
20cm
40cm
如图点O是⊙O的圆心点ABC在⊙O上AO∥BC∠AOB=42°则∠OAC的度数是.
如图3所示C.为线段AE上一动点不与点
,E.重合),在AE同侧分别作正△ABC和正△CDE,AD与BE交于点O.,AD与BC交于点P.,BE与CD交于点Q.,连接PQ.以下四个结论:①△ACD≌△BCE;②AD=BE;③∠AOB=60°;④△CPQ是等边三角形.其中正确的是( ) A.①②③④
②③④
①③④
①②③
如图
B.C.D.四个点均在⊙O.上,∠AOD=70°,AO∥DC,则∠
的度数为( )
A.40°B.45°
50°
55°
如图A.B.C.D.处⊙O.上的四个点.AB=AC.AD交BC于点E.AE=3ED=4.则AB的长为
如图
B.C.D四个点均在⊙O上,∠AOD=70°,AO∥DC,则∠B的度数为( )
A. 40°
45°
50°
55°
如图ABCD是⊙O上的四个点=若∠AOB=58°则∠BDC=度.
如图已知ABCD是⊙O上的四个点AB=BCBD交AC于点E连接CDAD.求证DB平分∠ADC.
如图在边长为1的小正方形组成的网格中△AOB的三个顶点均在格点上点A.B.的坐标分别是A.13B.3
如图正方形ABCD的四个顶点分别在⊙O.上点P.在上不同于点C.的任意一点则∠BPC的度数是
45°
60°
75°
90°
如图在半径为3cm的⊙O中点D是劣弧AB的中点点C是优弧AB上一点∠C=30°下列四个结论①∠AO
①③
②④
②③④
①③④
若点A是双曲线上一点AB⊥x轴于点B点O为直角坐标的原点△AOB的面积为3则点A的坐标可能是下面四
(﹣3,1)
(2,﹣3)
(2,﹣1)
(﹣3,3)
如图梯形ABCD的对角线交于点O.有以下四个结论①△AOB∽△COD②△AOD∽△ACB③④其中始终
1个
2个
3个
4个
如图所示E.F.分别是正方形ABCD的边CDAD上的点且CE=DFAEBF相交于点O.下列结论①AE
1个
2个
3个
4个
如图四边形ABCD的四个顶点都在⊙O上且AD∥BC对角线AC与BC相交于点E.那么图中有______
如图在半径为6cm的⊙O.中点
是劣弧
的中点,点D.是优弧
上一点,且∠D.=30°,下列四个结论: ①OA⊥BC;②BC=6
;③sin∠AOB=
;④四边形ABOC是菱形. 其中正确结论的序号是( )
A.①③
①②③④
②③④
①③④
如图A.B.C.D.是⊙O.上的四个点=若∠AOB=58°则∠BDC=度.
平面内有四个不同的点A.O.B.C.其中∠AOB=120°∠ACB=60°AO=BO=2则满足题意的
如图C.为线段AE上一动点不与点
,E.重合),在AE同侧分别作等边三角形ABC和等边三角形CDE,AD与BE交于点O.,AD与BC交于点P.,BE与CD交于点Q.,连结PQ. 则四个结论:① AD=BE;②∠OED=∠EAD;③ ∠AOB=60°; ④ DE=DP中错误的是 A.①
②
③
④
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