[青岛版]五年级数学对称-平移与旋转演示课件.ppt

* 青岛版数学五年级上册 对称、平移和旋转 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 图 片 欣 赏 蝴 蝶 秋天落叶 蜻 蜓 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 沿着一条直线 对折 两侧的图形 完全重合 这类图形有什么共同的特征？ 如果一个图形沿着一条直线对折，两侧的图形能够完全重合，这个图形就是 轴对称图形。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 一条直线 折痕 所在的这条直线 叫做对称轴。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 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. 你能画出下面长方形的对称轴吗？ . . . . 长方形有两条对称轴。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 正方形有四条对称轴。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 折一折，看看哪些是轴对称图形，哪些不是。 是轴对称图形的，请你分别画出它的对称轴。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 想想做做2： 下面的图形都是轴对称图形吗？是轴对称图形的各有几条对称轴？试着把它们画出来。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 画出图形的另一半，使它成为一个轴对称图形。 . . . . . . Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 想想做做4： 画出下面每个图形的对称轴，你发现了什么？ 3条 4条 5条 6条 等边三角形 （正三角形） 正方形 （正四边形） 正五边形 正六边形 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. 对称美 风筝 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 对称美 飞机 汽车 军舰 Evaluation only. Created with Aspose.Slides for .