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如图，OA⊥OB，若∠1=55°，则∠2的度数是（ ）A．35°B．45°C．55°D．65°
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如图OA⊥OB若∠1=40°则∠2的度数是
20°
40°
50°
60°
如图OAOB分别为⊙O.的半径若CD⊥OACE⊥OB垂足分别为D.E.∠P=70°则∠DCE的度数为
70°
60°
50°
40°
如图⊙O.的半径OAOB且OA⊥OB连结AB.现在⊙O.上找一点C.使OA2+AB2=BC2则∠OA
15°或75°
20°或70°
20°
30°
如图OA⊥OCOB⊥OD若∠AOB=25°求∠DOC的度数.
已知点D.是等边△ABC内的任一点连接OAOBOC.1如图1己知∠AOB＝150°∠BOC＝120°
如图OA⊥OB引射线OC点C.在∠AOB外OD平分∠BOCOE平分∠AOD.1若∠BOC=40°请依
如图射线OA的方向是北偏东15°射线OB的方向是北偏西40°∠AOB=∠AOC射线OD是OB的反向延
已知如图OAOB是⊙O.的两条半径且OA⊥OB点C.在⊙O.上则∠ACB的度数为
45°
35°
25°
20°
如图⊙O.的半径OAOB且OA⊥OB连结AB.现在⊙O.上找一点C.使OA2+AB2=BC2则∠OA
15°或75°
20°或70°
20°
30°
如图OA⊥OB若∠1=40°则∠2的度数是
20°
40°
50°
60°
在直角坐标系中OA=CDOB=ODCD⊥x轴于D.E.F.分别是OBOD中点连接EF交AC于点G.Ⅰ
已知点O.是等边△ABC内的任一点连接OAOBOC.1如图1已知∠AOB=150°∠BOC=120°
如图在⊙O.中OA⊥OB∠A=20°求∠B.的度数.
已知如图OAOB是⊙O.的两条半径且OA⊥OB点C.在⊙O.上则∠ACB的度数为
45°
35°
25°
20°
从O.点引三条射线OAOB和OC若∠AOB＝60°∠BOC＝20°则∠AOC的度数为__
如图OA⊥OBOC⊥OD∠BOC=28°求∠AOD的度数
已知点O.是等边△ABC内的任一点连接OAOBOC.1如图1已知∠AOB=150°∠BOC=120°
如图OA⊥OB若∠1=40°则∠2的度数是
20°
40°
50°
60°
已知如图BC∥OA∠B.=∠A.=100°试回答下列问题1如图①所示求证OB∥AC.注意证明过程要写
如图OA⊥OB∠1=35°则∠2的度数是
35°
45°
55°
70°
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