初中数学演示课件人教版

《初中数学演示课件人教版》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、4.2.1直线、射线、线段做课教师：刘佳秀做课班级：七年三班Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.复习提问1）六棱柱由什么围成？面与面相交是什么

2、？线与线相交是什么？2）点动成什么？线动成什么？面动成什么？答：长方形和六边形线点线面体Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.建筑工人在砌墙时,

3、为了使每行砖在同一水平线上,经常在两个墙角分别立一根标志杆,在两根标志杆的同一高度处拉一根绳.你知道这是什么道理吗?你知道吗一、问题情境：Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2

4、011AsposePtyLtd.生活情景Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.说一说生活中有哪些物体可以近似地看成线段、射线、直线？绷紧的琴弦、

5、人行横道都可以近似地看做线段。手电筒的光柱类似射线；笔直的马路和笔直的铁轨给我们以直线的形象.活动一：探究活动Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLt

6、d.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5Cl

7、ientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Eva

8、luationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.学一学，议一议如何用数学符号表示一个点呢？——用一个大写字母表示。例如点A，点B，点C，点D，点E等。Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.