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如图,点A、B、C都在⊙O上,若∠AOC=140°,则∠B的度数是( )
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如图OAOC是⊙O.的半径点B.在⊙O.上连接ABBC若∠ABC=40°则∠AOC=度.
如图所示点O.是直线AB上一点OEOF分别平分∠AOC和∠BOC若∠AOC=68°则∠BOF和∠EO
如图点
B.C.都在⊙O.上,若∠AOC=140°,则∠
的度数是( )
A.70°B.80°
110°
140°
如图A.B.C.是⊙O.上的三个点若∠AOC=100°则∠ABC等于__
.如图O.是直线AB上一点∠AOC=50°则∠BOC的度数是
120°
130°
140°
150°
如图ABC三点在⊙O上连接ABCO若∠AOC=140°则∠B的度数为
@B.C三点在⊙O上,连接ABCO,若∠AOC=140°,则∠B的度数为( )
A.140° B.120°
110°
130°
1如图①所示点O.在直线AC上过O.点作射线OB请画出∠COB的平分线OF和∠AOB的平分线OE求∠
如图AB.CD交于点O∠AOE=90°若∠AOC∠COE=54则∠AOD等于
150°
140°
120°
130°
如图AB是⊙O.直径若∠AOC=140°则∠D.的度数是▲
20°
30°
40°
70°
如图AB是⊙O.直径点C.在⊙O.上AE是⊙O.的切线
为切点,连接BC并延长交AE于点D.若∠AOC=80°,则∠ADB的度数为( )
A.40°
50°
60°
20°
如图点O.是直线AB上一点OD平分∠BOC∠COE=90°.1若∠AOC=36°求∠DOE的度数2若
如图直线AB与CD相交于点O.∠COE=2∠BOE.若∠AOC=120°则∠DOE等于
135°
140°
145°
150°
如图点
B.C.都在⊙O.上,若∠AOC=140°,则∠
的度数是 A.70°B.80°
110°
140°
如图ABC三点都在⊙O上点D是AB延长线上一点∠CBD=70°则∠AOC的度数为
@B.C三点都在⊙O上,点D是AB延长线上一点,∠CBD=70°,则∠AOC的度数为( )
A.55° B.70°
110°
140°
如图A.B.C.是⊙O.上的三个点若∠AOC=100°则∠ABC等于__
如图
B.C.是⊙O.上的三点,∠
=75°,则∠AOC的度数是( )
A.150°B.140°
130°
120°
如图
,
,
是⊙O上的三点,且∠ABC=70°,则∠AOC的度数是( ) A.35°B.140°C.70°
70°或140°
如图四边形ABCD内接于⊙O.E.为CD延长线上一点若∠ADE=110°则∠AOC的度数是
70°
110°
140°
160°
如图
B.C.三点都在⊙O上,点D.是AB延长线上一点,∠AOC=140°, ∠CBD 的度数是( ) A.40°
50°
70°
110°
如图ABC三点都在⊙O上点D是AB延长线上一点∠AOC=140°∠CBD的度数是
40°
50°
70°
110°
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