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1、学习好资料欢迎下载图形的变换旋转教学设计教学目标：1、通过生活事例，使学生初步了解图形的旋转变换。结合生活实际，能初步感知旋转现象，探索旋转的特征和性质。2、通过动手操作，使学生会在方格纸上将一个简单图形旋转90。3、初步学会运用旋转的方法在方格纸上设计图案，发展学生的空间观念。4、欣赏图形的旋转变换所创造出的美，培养学生的审美能力；感受旋转在生活中的应用，体会数学的价值。教学重点：1、理解图形旋转变换的含义。2、探索图形旋转的特征和性质。教学难点：能在方格纸上将一个简单图形旋转90。教学过程：一、情景导入同学们，你们喜欢做游戏吗？今天老师给你们带来一个魔方，再做这个游戏时，最常用到的操作时什
2、么？（旋转）请同学们用手示范一下怎样进行旋转？（学生用手势演示）问：你们在做旋转手势时为什么有的向左旋转，有的向右旋转？（因学习好资料欢迎下载为有的是顺时针旋转，有的是逆时针旋转。）集体联系顺时针旋转90 度和逆时针旋转90 度。请一人到投影前操作魔方。其他同学提示其具体的旋转方向。师：刚才同学们在做游戏的过程中，反复提到一个词“旋转”，这节课，咱们就来共同研究“旋转”。板书课题：旋转二、反馈并明确概念1、联系生活师：生活中，你还见过哪些旋转现象呢？生反馈：风扇、陀螺、钟表、车轮、风车课件出示几种旋转现象。师：同学们说的这几种都是旋转现象，那么旋转有怎样的特征和性质呢？我们借助最常见的钟表来进
3、行研究吧。2、学习例 3.（1）认识线段的旋转，理解旋转的含义。出示钟表实物。师：请同学们观察钟表的指针，描述指针从“12”到“1”师怎样旋转的。（指针从“12”绕点 O 顺时针旋转 30到“1”）师演示指针由“1”到“3”。问：这次指针又是如何旋转的？（指针从“1”绕点O 顺时针旋转 60到“3”）师演示指针由“3”到“6”。文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9
4、U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5
5、E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C
6、4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1
7、O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7
8、B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G
9、1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9
10、O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1学习好资料欢迎下载生反馈：指针从几开始？是绕哪个点旋转的？怎样旋转？旋转了多少度？（2）明确旋转要素旋转物体起止位置绕哪一点旋转方向旋转度数板书：点方向度数师：要想清楚说明旋转现象，明确以上几个要素最为重要。三、探索图形旋转的特征和性质1、观察风车的旋转过程。(出示课件)请学生说一说，在风的吹动下，风车是如何旋转的。风车绕点 O 逆时针旋转 90。思考：你是怎样判断风车旋转的角度呢？小组交流观察到的现象。一是由图 1 到图 2，风车绕点 O 逆时针旋转了 90；二是根据三角形变换的位置判断风车旋转的角度；三是根据对应的线段判断风
11、车旋转的角度；四是根据对应的点判断风车旋转的角度。2、小结通过观察，我们发现风车旋转后，不仅每个三角形都绕点O 逆时针旋转了 90，而且，每条线段，每个顶点，都绕点O 逆时针旋转了90.3、概括旋转的特征和性质。师：刚才通过观察我们发现，风车旋转后，每个三角形的位置都变了，那么什么没有变呢？（三角形的形状、大小没有变；点O 的位置没文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1
12、O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7
13、B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G
14、1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9
15、O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8
16、I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K
17、8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:C
18、Y9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1学习好资料欢迎下载有变；对应线段的长度没有变；对应线段的夹角没有变。）四、绘制图形1、自主画图。我们已经了解了一个图形旋转的全过程，想不想自己试着画一画呢？（1）出示例 4 方格纸。（2）请学生看清图形。（3）说一说你是怎样画的。引导学生明确：对应点与点 O 所连线段的夹角都是90；对应点到点O 的距离都相等。学生独立完成。（4）作品展示，交流画法。2、总结画法。我们在画一个旋转图形时，首先要确定它周围的点，然后找到这个图形各个点的对应点，最后连线。五、课堂作业设计教材第 6 页“做一做”第 1 题教材第 6 页“做一做”第
19、 2 题板书设计：旋转顺时针绕中心点 O 方向角度（固定）逆时针文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I
20、7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8
21、G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY
22、9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT
23、8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8
24、K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:
25、CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1学习好资料欢迎下载时针绕点 O 顺时针旋转 30 度时针绕点 O 顺时针旋转 60 度时针绕点 O 顺时针旋转 90 度三角形点 O 逆时针旋转 90 度文档编码:CY9O1O9U10Z7 HT8I7
26、B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G
27、1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9
28、O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8
29、I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K
30、8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:C
31、Y9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1文档编码:CY9O1O9U10Z7 HT8I7B5E1S7 ZC8K8G1C4Z1