九年级数学期末复习综合试卷三.ppt

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008 综合练习(3) * Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 3.下列说法中,正确的是 ( ) A.弧可分为优弧和劣弧; B.直径是圆中最长的弦; C.三点确定一个圆; D.圆是轴对称图形,每条直径 都是它的对称轴. × √ × × Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 4.命题:①等弧所对的圆周角相等; ②相等的圆周角所对的弦相等; ③同一条弧所对的两个圆周角 必相等或互补; ④在同圆中,同弦或等弦所对的圆周角 相等. 其中不正确的有 (   )   A. 1个 B. 2个 C. 3个 D. 4个 × √ × × Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. A D B F C E 第8题 1 2 3 4 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 第18题 x Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 1 2 第20题 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 23.已知:如图,在Rt△ABC中,∠C=90°,点O在AB上,以O为圆心,OA长为半径的圆与AC,AB分别交于点D,E.且∠CBD=∠A. (1)判断直线BD与⊙O的位置关系,并证明你的结论; (2)若AD:A0=8:5,BC=2,求BD的长. D C O A B E 1 2 F Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. ● ● Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. A2 B C 铅垂高 水平宽 h a 图1 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 图2 x C O y A B D 1 1 (1,4) (1,2) Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2

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