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若一个直角三角形的两边分别为6和8,则这个直角三角形外接圆直径是( ) A.8 ...
若一个直角三角形的两边分别为6和8,则这个直角三角形外接圆直径是( )
A.8
B.10
C.5或4
D.10或8
考点分析:
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已知:如图,△ABC中,∠A=60°,BC为定长,以BC为直径的⊙O分别交AB、AC于点D、E.连接DE、OE.下列结论:①BC=2DE;②D点到OE的距离不变;③BD+CE=2DE;④AE为外接圆的切线.其中正确的结论是( )
A.①②
B.③④
C.①②③
D.①②④
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已知:如图,⊙O是△ABC的外接圆,D为CB延长线上一点,∠AOC=130°,则∠ABD的度数为( )
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A.40°
B.50°
C.65°
D.100°
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已知正三角形外接圆半径为
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,这个正三角形的边长是( )
A.2
B.3
C.4
D.5
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如图,⊙O是等边△ABC的外接圆,P是⊙O上一点,则∠CPB等于( )
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A.30°
B.45°
C.60°
D.90°
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如图,⊙O是等边三角形ABC的外接圆,⊙O的半径为2,则等边三角形ABC的边长为( )
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A.
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B.
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C.
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D.
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