4.2.1直线、射线、线段学案.pdf

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1、1 4.2.1 直线、射线、线段学习目标：1、认识直线、射线、线段及它们的联系和区别，掌握它们的表示方法；2、了解“两点确定一条直线”的性质；3、能根据语句画出相应的图形，会用语句描述简单的图形。学习重难点：直线、射线、线段的区别与联系，直线、射线、线段的表示，建立几何语句与图形之间的联系是重点；把几何图形与语句表示、符号书写联系起来是难点。学习方法：自主 合作 交流 展示教学过程：一、创 设情境，引入新课我们知道，点是几何研究的最基本的图形，点动成线，线有直线、射线和线段。今天我们就来学习这些简单的几何图形。二、自 主学习名称图形读作端点个数延伸性可否度量直线射线线段三、合作探究活动一：探究

2、直线的性质（一）、如果你想将一根细木条固定在墙上，至少需要几个钉子？（2）经过一个已知点的直线，可以画多少条直线？请画图说明。(3)经过两个已知点画直线，可以画多少条直线？请画图试试。A A B 猜想：如果将细木条抽象成直线，将钉子抽象为点，你可以得到什么结论？直线的基本性质：经过两点有条直线，并且条直线。2 简述为：（二）、举例说明直线的性质在日常生活中的应用：1植树时，只要定出两个树坑的位置，就能确定同一行的树所在的直线，这是因为2建筑工人在砌墙时拉参照线,木工师傅锯木板时,用墨盒弹墨线,都是根据3平面内三点可确定条直线，请画图说明。（三）(1)平面上一个点与一条直线的位置有什么关系？画图

3、说明。(2)当两条直线有一个共公点时，我们就称这两条直线相交，这个公共点叫做它们的交点。请画图说明。(四)射线和线段（请画图说明。）1线段的表示方法：（1）用线段两个大写字母来表示，无先后顺序。（2）用一个表示。2射线的表示方法：（1）用射线的一个及射线上任意来表示（注意：端点的字母一定要写在前面）2）用一个表示。(五)读下面的语句，并按照这些语句画出图形1点 P在直线 AB上，但不在直线CD上。2点 Q既不在直线l1上，也不在直线l2上。3直线 a、b 交于点，直线b、c 交于点，直线c、a 交于点。4直线 a、b、c 两两相交。文档编码:CG8H5K10N6J2 HI5F2J5G8H2 Z

4、X9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编

5、码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J

6、2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2

7、 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文

8、档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N

9、6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8

10、H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T93 5.直线 a 和 b 相交于点 P；点 A在直线 a 上，但在直线b 外四、反馈检测1要把木条固定在墙上至少要钉_个钉子，这是因为_2经过一点的直线有_条；经过两点的直线有_条；并且 _一条；经过三点的直线 _存在，如点C不在经过A、B两点的直线AB上，那么 _经过A、B、C三点的直线3把线段向一个方向延长，得到的是 _

11、；把线段向两个方向延长，得到的是 _4线段有 _个端点，射线有_个端点，直线有_个端点5如图，点O在线段AB_；点B在射线AB_；点A是线段AB的一个 _6如图，图中有_条射线，_条线段，这些线段是_7如图，AC，BD交于点O，图中共有 _条线段，它们分别是_8如图，图中有_条线段，它们是_图中以A点为端点的射线有_条，它们是_图中有 _条直线，它们是_9根据“反向延长线段CD”这句话，下图表示正确的是()10如图所示，有直线、射线和线段，根据图中的特征判断其中能相交的是()文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 H

12、I5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX

13、9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码

14、:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2

15、 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2

16、ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档

17、编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6

18、J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T94 11下列说法中正确的有()钢笔可看作线段探照灯光线可看作射线笔直的高速公路可看作一条直线电线杆可看作线段(A)1 个(B)2 个(C)3 个(D)4 个12下列说法中正确的语句共有()直线AB与直线BA是同一条直线线段AB与线段BA表示同一条线段射线AB与射线BA表示同一条射线延长射线AB至C，使ACBC延长线段AB至C，使BCAB直线总比线段长(A)2 个(B)3 个(C)4

19、 个(D)5 个13读下面的语句，并按照这些语句画出图形 (1)点P在直线AB上，点M在直线AB外(2)直线AB、CD交于点O，点M在直线AB上，但不在CD上(3)经过点O的三条直线a，b，c14按要求画图：(1)画直线BD(2)画射线AC和AD(3)延长线段AB(4)反向延长线段AB五、课后反思(1)两条直线在同一平面内的位置关系有几种?(2)画图表示，两条直线可以把一个平面分成几个部分?三条直线呢?(3)平面上 4 条直线最多可以把平面分成多少个部分?文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2

20、 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文

21、档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N

22、6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8

23、H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T

24、9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K1

25、0N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9文档编码:CG8H5K10N6J2 HI5F2J5G8H2 ZX9N8I6P9T9