九年级数学圆课件1.ppt

数学· 新课标( RJ) Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 第 24 章复习 2 ┃知识归类┃知识归纳┃ ,它的对称轴是, 有条对称轴. 圆是图形,它的对称中心是, 圆绕圆心旋转和自身重合. 轴对称直径所在的直线无数中心对称圆心任意角度 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 第 24 章复习 2 ┃知识归类数学· 新课标( RJ) 平分弦弦所对的两条弧 AM = BM 不是直径垂直于弦平分弦所对的两条弧 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 第 24 章复习 2 ┃知识归类数学· 新课标( RJ) 符号语言(如图 24-12所示): ∵CD是⊙O的直径, CD平分 AB, ∴, , . CD ⊥ AB Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 第 24 章复习 2 ┃知识归类数学· 新课标( RJ) [ 易错点] 推论“平分弦( 不是直径) 的直径垂直于弦,并且平分弦所对的两条弧”中“弦不是直径”是它的重要条件, 因为一个圆的任意两条直径总是互相平分的,但是它们未必垂直. Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. luation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. luation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011