1、112.2.2 三角形全等的判定三角形全等的判定(SAS)第十二章第十二章 全等三角形全等三角形Please Enter Your Detailed Text Here,The Content Should Be Concise And Clear,Concise And Concise Do Not Need Too Much Text人教版 数学（初中）（八年级 上）2PPT模板：om/moban/PPT素材：om/sucai/PPT背景：om/beijing/PPT图表：om/tubiao/PPT下载：om/xiazai/PPT教程：om/powerpoint/资料下载：om/zilia
2、o/个人简历：om/jianli/试卷下载：om/shiti/教案下载：om/jiaoan/手抄报：om/shouchaobao/PPT课件：om/kejian/语文课件：om/kejian/yuwen/数学课件：om/kejian/shuxue/英语课件：om/kejian/yingyu/美术课件：om/kejian/meishu/科学课件：om/kejian/kexue/物理课件：om/kejian/wuli/化学课件：om/kejian/huaxue/生物课件：om/kejian/shengwu/地理课件：om/kejian/dili/历史课件：om/kejian/lishi/前前 言言
3、学习目标学习目标1.掌握“边角边”条件的内容，并能初步应用“边角边”条件判定两个三角形全等。2.使学生经历探索三角形全等条件的过程,体会如何探索研究问题,并初步体会分类思想,提高学生分析问题和解决问题的能力。3.通过画图、比较、验证，培养学生注重观察、善于思考、不断总结的良好思维习惯。重点难点重点难点重点：掌握“边角边”判定两个三角形全等的方法。难点：掌握“边角边”判定两个三角形全等的方法。3PPT模板：om/moban/PPT素材：om/sucai/PPT背景：om/beijing/PPT图表：om/tubiao/PPT下载：om/xiazai/PPT教程：om/powerpoint/资料下
4、载：om/ziliao/个人简历：om/jianli/试卷下载：om/shiti/教案下载：om/jiaoan/手抄报：om/shouchaobao/PPT课件：om/kejian/语文课件：om/kejian/yuwen/数学课件：om/kejian/shuxue/英语课件：om/kejian/yingyu/美术课件：om/kejian/meishu/科学课件：om/kejian/kexue/物理课件：om/kejian/wuli/化学课件：om/kejian/huaxue/生物课件：om/kejian/shengwu/地理课件：om/kejian/dili/历史课件：om/kejian/l
5、ishi/情况1：两边和它们的夹角相等，两三角形全等吗？画一个ABC ，使两边和夹角相等？ABC画法：画法：AB C DE1.画DA E=A；2.在射线A E上截取A C =AC,在射线A D上截取A B =AB；3.连接B C。（三角形三边相等两三角形全等）全等全等思考思考4PPT模板：om/moban/PPT素材：om/sucai/PPT背景：om/beijing/PPT图表：om/tubiao/PPT下载：om/xiazai/PPT教程：om/powerpoint/资料下载：om/ziliao/个人简历：om/jianli/试卷下载：om/shiti/教案下载：om/jiaoan/手抄报
6、：om/shouchaobao/PPT课件：om/kejian/语文课件：om/kejian/yuwen/数学课件：om/kejian/shuxue/英语课件：om/kejian/yingyu/美术课件：om/kejian/meishu/科学课件：om/kejian/kexue/物理课件：om/kejian/wuli/化学课件：om/kejian/huaxue/生物课件：om/kejian/shengwu/地理课件：om/kejian/dili/历史课件：om/kejian/lishi/由以上尺规作图的方法可以得到以下基本事实：由以上尺规作图的方法可以得到以下基本事实：两边和它们的夹角分别相等
7、的两个三角形全等。（即“边角边”或“SAS”）小结小结5PPT模板：om/moban/PPT素材：om/sucai/PPT背景：om/beijing/PPT图表：om/tubiao/PPT下载：om/xiazai/PPT教程：om/powerpoint/资料下载：om/ziliao/个人简历：om/jianli/试卷下载：om/shiti/教案下载：om/jiaoan/手抄报：om/shouchaobao/PPT课件：om/kejian/语文课件：om/kejian/yuwen/数学课件：om/kejian/shuxue/英语课件：om/kejian/yingyu/美术课件：om/kejian
8、/meishu/科学课件：om/kejian/kexue/物理课件：om/kejian/wuli/化学课件：om/kejian/huaxue/生物课件：om/kejian/shengwu/地理课件：om/kejian/dili/历史课件：om/kejian/lishi/在在ABC与与DEF中中AB=DEB=EBC=EFABC DEF（SAS）ABCDEF用语言表达如下：用语言表达如下：小结小结6PPT模板：om/moban/PPT素材：om/sucai/PPT背景：om/beijing/PPT图表：om/tubiao/PPT下载：om/xiazai/PPT教程：om/powerpoint/资料
9、下载：om/ziliao/个人简历：om/jianli/试卷下载：om/shiti/教案下载：om/jiaoan/手抄报：om/shouchaobao/PPT课件：om/kejian/语文课件：om/kejian/yuwen/数学课件：om/kejian/shuxue/英语课件：om/kejian/yingyu/美术课件：om/kejian/meishu/科学课件：om/kejian/kexue/物理课件：om/kejian/wuli/化学课件：om/kejian/huaxue/生物课件：om/kejian/shengwu/地理课件：om/kejian/dili/历史课件：om/kejian/
10、lishi/情况2：两边和其中一边的对角相等，两三角形全等吗？如图,ABC与ABD中，AB=AB，AC=AD，B=B,他们全等吗？他们全等吗？BACDBADBAC不全等不全等思考思考7PPT模板：om/moban/PPT素材：om/sucai/PPT背景：om/beijing/PPT图表：om/tubiao/PPT下载：om/xiazai/PPT教程：om/powerpoint/资料下载：om/ziliao/个人简历：om/jianli/试卷下载：om/shiti/教案下载：om/jiaoan/手抄报：om/shouchaobao/PPT课件：om/kejian/语文课件：om/kejian/
11、yuwen/数学课件：om/kejian/shuxue/英语课件：om/kejian/yingyu/美术课件：om/kejian/meishu/科学课件：om/kejian/kexue/物理课件：om/kejian/wuli/化学课件：om/kejian/huaxue/生物课件：om/kejian/shengwu/地理课件：om/kejian/dili/历史课件：om/kejian/lishi/因铺设电线的需要，要在池塘两侧因铺设电线的需要，要在池塘两侧A、B处各埋设一根电线杆（如图），因无法直接量出处各埋设一根电线杆（如图），因无法直接量出A、B两点的距离，现有一足够的米尺请你设计一种方案，
12、粗略测出两点的距离，现有一足够的米尺请你设计一种方案，粗略测出A、B两杆之间的距离两杆之间的距离分析：先在池塘旁取一个能直接到达分析：先在池塘旁取一个能直接到达A和和B处的点处的点C，连结，连结AC并延并延长至长至D点，使点，使DC=AC，连结，连结BC并延长至并延长至E点，使点，使EC=BC，连结，连结DE，用米尺测出用米尺测出DE的长，这个长度就等于的长，这个长度就等于A，B两点的距离请你说明两点的距离请你说明理由理由 AC=DC ACB=DCE BC=EC ACB DCE AB=DE对顶角相等思考思考8PPT模板：om/moban/PPT素材：om/sucai/PPT背景：om/beij
13、ing/PPT图表：om/tubiao/PPT下载：om/xiazai/PPT教程：om/powerpoint/资料下载：om/ziliao/个人简历：om/jianli/试卷下载：om/shiti/教案下载：om/jiaoan/手抄报：om/shouchaobao/PPT课件：om/kejian/语文课件：om/kejian/yuwen/数学课件：om/kejian/shuxue/英语课件：om/kejian/yingyu/美术课件：om/kejian/meishu/科学课件：om/kejian/kexue/物理课件：om/kejian/wuli/化学课件：om/kejian/huaxue/
14、生物课件：om/kejian/shengwu/地理课件：om/kejian/dili/历史课件：om/kejian/lishi/ABDO1.在下列推理中填写需要补充的条件，使结论成立：在下列推理中填写需要补充的条件，使结论成立：(1)如图如图,在在AOB和和DOC中中AO=DO(已知已知)_=_()BO=CO(已知已知)AOB DOC（）AOB DOC对顶角相等对顶角相等CSAS课堂测试课堂测试9PPT模板：om/moban/PPT素材：om/sucai/PPT背景：om/beijing/PPT图表：om/tubiao/PPT下载：om/xiazai/PPT教程：om/powerpoint/资
15、料下载：om/ziliao/个人简历：om/jianli/试卷下载：om/shiti/教案下载：om/jiaoan/手抄报：om/shouchaobao/PPT课件：om/kejian/语文课件：om/kejian/yuwen/数学课件：om/kejian/shuxue/英语课件：om/kejian/yingyu/美术课件：om/kejian/meishu/科学课件：om/kejian/kexue/物理课件：om/kejian/wuli/化学课件：om/kejian/huaxue/生物课件：om/kejian/shengwu/地理课件：om/kejian/dili/历史课件：om/kejian
16、/lishi/(2)如图，在如图，在AEC和和ADB中，已知中，已知AE=AD，AC=AB，请说明，请说明AEC ADB的理由。的理由。AEBDC_=_(已知已知)A=A(公共角公共角)_=_(已知已知)AEC ADB（）AEADACAB解：在解：在AEC和和ADB中中SAS课堂测试课堂测试10PPT模板：om/moban/PPT素材：om/sucai/PPT背景：om/beijing/PPT图表：om/tubiao/PPT下载：om/xiazai/PPT教程：om/powerpoint/资料下载：om/ziliao/个人简历：om/jianli/试卷下载：om/shiti/教案下载：om/j
17、iaoan/手抄报：om/shouchaobao/PPT课件：om/kejian/语文课件：om/kejian/yuwen/数学课件：om/kejian/shuxue/英语课件：om/kejian/yingyu/美术课件：om/kejian/meishu/科学课件：om/kejian/kexue/物理课件：om/kejian/wuli/化学课件：om/kejian/huaxue/生物课件：om/kejian/shengwu/地理课件：om/kejian/dili/历史课件：om/kejian/lishi/（SAS）AD=BC.请说明理由。请说明理由。AD=BC（）课堂测试课堂测试11PPT模板
18、：om/moban/PPT素材：om/sucai/PPT背景：om/beijing/PPT图表：om/tubiao/PPT下载：om/xiazai/PPT教程：om/powerpoint/资料下载：om/ziliao/个人简历：om/jianli/试卷下载：om/shiti/教案下载：om/jiaoan/手抄报：om/shouchaobao/PPT课件：om/kejian/语文课件：om/kejian/yuwen/数学课件：om/kejian/shuxue/英语课件：om/kejian/yingyu/美术课件：om/kejian/meishu/科学课件：om/kejian/kexue/物理课件
19、：om/kejian/wuli/化学课件：om/kejian/huaxue/生物课件：om/kejian/shengwu/地理课件：om/kejian/dili/历史课件：om/kejian/lishi/ABCD3.已知：如图已知：如图AB=CB，ABD=CBD，ABD和和CBD全等吗？全等吗？（SAS）课堂测试课堂测试12PPT模板：om/moban/PPT素材：om/sucai/PPT背景：om/beijing/PPT图表：om/tubiao/PPT下载：om/xiazai/PPT教程：om/powerpoint/资料下载：om/ziliao/个人简历：om/jianli/试卷下载：om/
20、shiti/教案下载：om/jiaoan/手抄报：om/shouchaobao/PPT课件：om/kejian/语文课件：om/kejian/yuwen/数学课件：om/kejian/shuxue/英语课件：om/kejian/yingyu/美术课件：om/kejian/meishu/科学课件：om/kejian/kexue/物理课件：om/kejian/wuli/化学课件：om/kejian/huaxue/生物课件：om/kejian/shengwu/地理课件：om/kejian/dili/历史课件：om/kejian/lishi/4.如图，如图，AC=BD，CAB=DBA，你能判断，你能判
21、断BC=AD吗？说明理由吗？说明理由ABCDC （SAS）课堂测试课堂测试13PPT模板：om/moban/PPT素材：om/sucai/PPT背景：om/beijing/PPT图表：om/tubiao/PPT下载：om/xiazai/PPT教程：om/powerpoint/资料下载：om/ziliao/个人简历：om/jianli/试卷下载：om/shiti/教案下载：om/jiaoan/手抄报：om/shouchaobao/PPT课件：om/kejian/语文课件：om/kejian/yuwen/数学课件：om/kejian/shuxue/英语课件：om/kejian/yingyu/美术课
22、件：om/kejian/meishu/科学课件：om/kejian/kexue/物理课件：om/kejian/wuli/化学课件：om/kejian/huaxue/生物课件：om/kejian/shengwu/地理课件：om/kejian/dili/历史课件：om/kejian/lishi/ABCDFE1.如图如图,已知已知AB=DE,AC=DF,要说明要说明ABC DEF，还需增加一个，还需增加一个什么条件？什么条件？1.BE=CF(SSS)2.A=D(SAS)(答案不唯一)探索提高探索提高14PPT模板：om/moban/PPT素材：om/sucai/PPT背景：om/beijing/PP
23、T图表：om/tubiao/PPT下载：om/xiazai/PPT教程：om/powerpoint/资料下载：om/ziliao/个人简历：om/jianli/试卷下载：om/shiti/教案下载：om/jiaoan/手抄报：om/shouchaobao/PPT课件：om/kejian/语文课件：om/kejian/yuwen/数学课件：om/kejian/shuxue/英语课件：om/kejian/yingyu/美术课件：om/kejian/meishu/科学课件：om/kejian/kexue/物理课件：om/kejian/wuli/化学课件：om/kejian/huaxue/生物课件：o
24、m/kejian/shengwu/地理课件：om/kejian/dili/历史课件：om/kejian/lishi/FCBEDA2.如图如图:己知己知ADBC,AE=CF,AD=BC,E、都在直线上，试、都在直线上，试说明说明。A D D+A DEF EF(内错角相等两直线平行内错角相等两直线平行)探索提高探索提高15PPT模板：om/moban/PPT素材：om/sucai/PPT背景：om/beijing/PPT图表：om/tubiao/PPT下载：om/xiazai/PPT教程：om/powerpoint/资料下载：om/ziliao/个人简历：om/jianli/试卷下载：om/shi
25、ti/教案下载：om/jiaoan/手抄报：om/shouchaobao/PPT课件：om/kejian/语文课件：om/kejian/yuwen/数学课件：om/kejian/shuxue/英语课件：om/kejian/yingyu/美术课件：om/kejian/meishu/科学课件：om/kejian/kexue/物理课件：om/kejian/wuli/化学课件：om/kejian/huaxue/生物课件：om/kejian/shengwu/地理课件：om/kejian/dili/历史课件：om/kejian/lishi/2.如图，如图，AC=BD，1=2 求证求证:BC=AD变式变式1
26、:如图，如图，AC=BD,BC=AD求证求证:1=2ABCD12ABCD12变式变式2:如图，如图，AC=BD,BC=AD求证求证:C=DABCD探索提高探索提高16PPT模板：om/moban/PPT素材：om/sucai/PPT背景：om/beijing/PPT图表：om/tubiao/PPT下载：om/xiazai/PPT教程：om/powerpoint/资料下载：om/ziliao/个人简历：om/jianli/试卷下载：om/shiti/教案下载：om/jiaoan/手抄报：om/shouchaobao/PPT课件：om/kejian/语文课件：om/kejian/yuwen/数学课
27、件：om/kejian/shuxue/英语课件：om/kejian/yingyu/美术课件：om/kejian/meishu/科学课件：om/kejian/kexue/物理课件：om/kejian/wuli/化学课件：om/kejian/huaxue/生物课件：om/kejian/shengwu/地理课件：om/kejian/dili/历史课件：om/kejian/lishi/ABCD变式变式3:如图，如图，AC=BD,BC=AD求证求证:A=B探索提高探索提高17感 谢 各 位 的 仔 细 聆 听感 谢 各 位 的 仔 细 聆 听Please Enter Your Detailed Text Here,The Content Should Be Concise And Clear,Concise And Concise Do Not Need Too Much Text人教版 数学（初中）（八年级 上）
