2022年中心小学四年级数学教学设计 .pdf

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1、教学设计宁江区大洼镇中心小学戚继教学内容：人教版四年级上册35-36 页教学目标：1、进一步认识线段、射线和直线，知道线段、射线和直线的联系与区别。2、进一步认识角，知道角的含义，能用角的符号表示角。3、渗透事物之间相互联系和变化的观点。在活动中培养学生观察、操作、比较和抽象、概括的能力。教学重点：掌握直线、射线和角的含义；掌握直线、线段、射线的区别与联系。教学难点：掌握直线、线段、射线的区别与联系。教学准备：三角板、小组学习表单。教学过程：一、今天我很高兴来给四年级的同学上课，首先请同学欣赏一组图片课件展示图片：笔直的铁轨，弯曲的乡间小道等，看后师提问：有什么感受？呀！你用数学的眼光发现了美

2、，欣赏到了美的确，由线构成的世界，既美妙又神奇，有兴趣走进线的王国，去探求其中的奥秘吗？二、线的研究1、课件出示线段：你对线段有哪些了解呢？学生交流说说线段的特征板书：线段2、课件演示：把线段一端的端点去掉，引出射线提问：认真观察，这一端会发生什么变化？（演示：把一端延长）现在你看到的还是一条线段吗？组织交流讨论（或许会说出是射线）讲述：我们得到一种新的线，只有一个端点，可以向一端无限延伸，这样的线我们把它叫做射线。谈话：射线其实在我们的生活中并不陌生。生活中的手电筒发出的光。提问：生活中还有象这样一端可以无限延长的现象吗？太阳光等。提问：我们认识了射线，那谁能说说射线是什么样的？板书：射线3

3、、认知直线谈话：在生活中我们找到了线段和射线，还有一些曲线，可是有文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L

4、5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B

5、7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10

6、J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA1

7、0X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X

8、3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编

9、码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8一种在我们生活中很熟悉但却很不好找的线，它在数学王国了有很重要的位置，大家能猜出它是谁吗？想不想认识它

10、的样子？课件演示：动画延伸直线板书：直线4、合作交流：探究三线的联系与区别提问：每种线都有各自的特点，那么它们有什么区别与联系呢？下面需要大家认真观察、讨论，找出它们的区别与联系。活动之前请看清楚要求。课件出示活动要求：4 人小组分工合作，团结探索先画出三线的图示，再交流三线的区别与联系图例端点个数长度线段射线直线小组汇报后教师小结三线的区别（课件出示）线段：两个端点，可以度量长度射线：一个端点，向一方无限延伸直线：没有端点，向两边无限延伸提问：通过大家的观察比较，发现三种线有各自的特点，我们再来一起研究一下，直线、射线和线段之间有什么联系呢？（课件动态文档编码:CR9L2J1C5L5 HN8

11、B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J1

12、0J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA

13、10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3

14、X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档

15、编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9

16、L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5

17、L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8演示）学生交流讨论（略）小结：射线和线段都来自于直线，射线和线段都是直线的一部分。设计意图：通过看一看、说一说、找一找、比一比等一系列活动，使学生能深刻体验射线的特征，自觉地将射线与生活中的现象联系在一起，同

18、时利用直观动态演示，突出了三种线之间的联系，加深了对线段、射线、直线等概念的理解。5、学以致用说一说（判断并说明理由）课件出示 6、学以致用画一画根据刚才的探究，我们知道射线和直线都可以延伸，画的时候不能画完，所以只需要画出一部分就可以了，我们来比试一下，画一画吧！通过一点画直线，大家猜想一下，过这一点你能画多少条直线？我们试试看，看你在20 秒内可以画多少条！（学生活动）在心里数数，你画了多少条？看来20 秒内画的条数不一样，有的孩子画的快，就多画了几条。那大家想想，如果时间不限制，你可以画多少条？如果时间可以无限多，那你可以画多少条。那说明，通过一点的直线有多少条呢？（课件显示）出示 2

19、点画直线，大家猜猜要同时经过这两点，可以画多少条直线？学生画一画汇报结果，课件显示结果。过两点的直线只有一条。文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X

20、2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C

21、8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:

22、CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J

23、1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5

24、HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q

25、6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8有了刚才的经验，那么猜一猜，通过一点的射线有多少条？课件显

26、示：过一点可以画无数条射线。小结：过一点可以作出无数条射线。从一点起可以画出无数条射线，现在请大家画一点，然后从这一点开始只画两条射线，（指名学生到黑板上画，其余学生在练习纸上画）三、角的研究 1、引出角的概念谈话：观察有公共端点的这些射线，你能从中发现隐藏的图形吗？（角）通过刚才画角，想想你的角是怎么画成的？学生交流后，（课件演示角的动态形成过程）小结：从一点引出两条射线所组成的图形叫作角。设计意图：由具有公共端点的射线自然引出角的认识，将学生的视线从整体引向部分，突出主体部分，学生会看到一个角。这样的安排一方面自然过渡到“角的认识”的教学，另一方面又让学生实实在在地看到了角的形成过程。学生

27、看书学习角的各部分名称和角的记法交流汇报自学的知识，教师板书角的知识2、组织作角，理解角的大小和角的两边叉开程度有关。学生操作：利用手中的练习纸折出角，比一比同桌 2 人谁折的角大操作讨论：你有办法使角变大吗？文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10

28、J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA1

29、0X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X

30、3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编

31、码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L

32、2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L

33、5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B

34、7Q6J10J1 ZA10X2Q3X3C8提问：由次可知，角的大小与什么有关系呢？小结：角的大小与角的两边叉开的大小有关四、小结收获，运用新知通过今天的学习，你都学到了哪些知识？你想提醒同学们记住哪些知识呢？（板题：直线、射线和角）设计意图：课堂总结不但让学生回顾本节课所学知识，还引导学生反思自己的学习过程和方法，向同伴提出忠告，有利于学生更好地积累数学经验，获得学习方法，提高学习能力。五、拓展延伸（1）数出下图中有几个角？（2）找出下图中有哪些线，各有几条？设计意图：练习设计具有层次性、针对性和综合性，有助于学生对知识的理解，开拓了学生视野，培养学生解决问题的能力。附：板书设计直线、射线和角

35、文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:C

36、R9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1

37、C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 H

38、N8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6

39、J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1

40、ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2

41、Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8线段射线角直线设计意图：板书简洁明了、突出重点，十分简略地阐释了射线与角的联系。能给学生留下深刻的印象。文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA

42、10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3

43、X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档

44、编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9

45、L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5

46、L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8

47、B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8文档编码:CR9L2J1C5L5 HN8B7Q6J10J1 ZA10X2Q3X3C8