如图△ABC的内接圆于⊙O,∠C=45°,AB=4,则⊙O的半径为( ) A.2 B.4 C. D.5 |
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如图,C是⊙O上一点,O是圆心,若∠C=35°,则∠AOB的度数为( ) A.35° B.70° C.105° D.150° |
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如图,BD为⊙O的直径,∠A=30°,则∠CBD的度数为( ) A.30° B.45° C.60° D.80° |
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如图,B是线段AC的中点,过点C的直线l与AC成60°的角,在直线L上取一点P,使∠APB=30°,则满足条件的点P的个数是( ) A.3个 B.2个 C.1个 D.不存在 |
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如图,已知A、B、C在⊙O上,∠COA=100°,则∠CBA=( ) A.40° B.50° C.80° D.200° |
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如图,AB和CD都是⊙O的直径,∠AOC=50°,则∠C的度数是( ) A.20° B.25° C.30° D.50° |
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如图,点A,B,C在⊙O上,∠AOC=80°,则∠ABC的度数为( ) A.100° B.120° C.140° D.160° |
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如图,AC是⊙O的直径,∠BAC=20°,P是弧的中点,则∠PAB等于( ) A.35° B.40° C.60° D.70° |
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如图,点A、B、C在⊙O上,AO∥BC,∠OBC=40°,则∠ACB的度数是( ) A.10° B.20° C.30° D.40° |
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如图,∠BOD的度数是( ) A.55° B.110° C.125° D.150° |
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