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这可让他犯了难，施工现场距离项目部很远，没有车还真是不方便office,branchoffices(jurisdiction),riskmanagement,marketingmanagementsectorthroughsupervisionandinspectionfoundproblems,shouldbeassignedtheinvestigatorsarecorrectedinatimelymanner.27ththefifthchapterpenaltyunderanyofthefollowingacts,thentherelevantprovisionstopunishtheinvestigators,accordingtotheBank.Toconstituteacrimeshallbeinvestigatedforcriminalresponsibility:(A)onthebusinessthatarenotinvolvedintheinvestigation,issuedasurvey.(B)customercreditinformationarenotthoroughverification.(Iii)toparticipateincreditcustomersurveyisnotinplace,customersanddataisincomplete,untrue;heknowsbearacounterfeitedclientsissuingcredit.(D)doesnotprovideforduediligenceofcreditbusiness,pre-loaninvestigationform,concealingfactsorprovidingfalseinformationorshouldbefoundinanormalinvestigationfailedtodiscovertheriskfactors,leadtothereviewandapprovalpolicyerrors,loanrisk.(Five)onloanguaranteesofsurveynotinplace,notbyprovidesonarrived,andpledgerealforfieldverification,andassessment,andidentificationandregistration,notaccordingtoprovidesonguarantorofguaranteesqualificationandguaranteescapacityforsurveyverified,ledtoguaranteesloanlostauthenticity,andlegitimacy,andeffectivenessof;cycleloanbusinessintheofmortgage第八章角8.1角的表示导学目标1.掌握角的两种定义及有关概念；2.掌握角的四种表示方法；3.掌握平角、周角的概念；4.提高抽象、概括能力及操作实践能力.学习重点与难点角的两种定义及表示法；教学过程一．情景引入观察：多媒体显示一个角的图形.操作：由学生操作画角的过程.二．检测预习，提炼问题1.什么叫做角？它的两种定义分别是什么？2.角怎样用几何语言表示？3.在角的各种表示方法中应该注意什么？三.自主学习学生以问题为导引自学课本4—5页内容，时间为5分钟，为合作探究做好充分准备。四.合作探究1．观察：多媒体演示：秒针在钟面上转动；操作：学生把圆规的两只脚由并在一起到逐渐把一只脚旋转到另一个位置；思考：在秒针的转动过程中，有没有给我们形成角的形象？那么角又可以是怎样形成的呢？2．归纳:角的定义1：角是具有公共端点的两条射线组成的图形.角的定义2：角由一条射线绕着它的端点旋转到另一个位置所成的图形，处于初始位置的那条射线叫做角的始边，终止位置的那条射线叫做角的终边.说明：由学生画出角的过程，来体验角的定义的含义，并且由学生自己用文字语言来概括角的定义.3．角的表示方法⑴用角的符号∠，加上三个大写英文字母表示.例如，∠ABC、∠XYZ.⑵用角的符号∠，加上表示顶点的一个大写字母表示.例如，∠A、∠B.⑶用角的符号∠，加上一个希腊字母表示.例如，∠α、∠β⑷用角的符号∠，加上一个数字表示.例如，∠1、∠24．平角与周角平角的定义：当角的终边与始边成一条直线时所成的角叫做平角。周角的定义：当射线旋转一周回到起始位置时所成的角叫做周角。五.质疑再探⑴填表：这可让他犯了难，施工现场距离项目部很远，没有车还真是不方便office,branchoffices(jurisdiction),riskmanagement,marketingmanagementsectorthroughsupervisionandinspectionfoundproblems,shouldbeassignedtheinvestigatorsarecorrectedinatimelymanner.27ththefifthchapterpenaltyunderanyofthefollowingacts,thentherelevantprovisionstopunishtheinvestigators,accordingtotheBank.Toconstituteacrimeshallbeinvestigatedforcriminalresponsibility:(A)onthebusinessthatarenotinvolvedintheinvestigation,issuedasurvey.(B)customercreditinformationarenotthoroughverification.(Iii)toparticipateincreditcustomersurveyisnotinplace,customersanddataisincomplete,untrue;heknowsbearacounterfeitedclientsissuingcredit.(D)doesnotprovideforduediligenceofcreditbusiness,pre-loaninvestigationform,concealingfactsorprovidingfalseinformationorshouldbefoundinanormalinvestigationfailedtodiscovertheriskfactors,leadtothereviewandapprovalpolicyerrors,loanrisk.(Five)onloanguaranteesofsurveynotinplace,notbyprovidesonarrived,andpledgerealforfieldverification,andassessment,andidentificationandregistration,notaccordingtoprovidesonguarantorofguaranteesqualificationandguaranteescapacityforsurveyverified,ledtoguaranteesloanlostauthenticity,andlegitimacy,andeffectivenessof;cycleloanbusinessintheofmortgage-2-⑵用三个大写字母表示下列图形中的角.⑶直线是平角吗？射线是周角吗？试说明理由。六．拓展提升例题：一天放学后，小明从学校（A）先沿着正东方向的马路走100米，然后走一段东北方向的小路100米，最后又走了一段西北方向的小路100米到家.（1）请画出小明这天回家的路线图（比例尺为1∶5000）；（2）请测量出小明家在学校的什么方向上？说明：补充这两个例题，主要让学生体会角在生活中被广泛运用，加深学生对所学数学知识的理解，活跃课堂学习的氛围.七．课堂小结今天我们学习到了那些数学知识？让你体会最深的是什么？八．有效训练⑴用一个大写字母或一个希腊字母表示图中的角.⑵图中共有（）角，并分别用一个大写字母或三个大写字母表示.九.课后延伸1.课本6页习题8.1，练习册8.1角的表示.2.预习第二节《角的比较》，找出需要探究的问题。角∠ABC∠EFG∠MON顶点边ABDCOEFDABCDCABBCAEF这可让他犯了难，施工现场距离项目部很远，没有车还真是不方便office,branchoffices(jurisdiction),riskmanagement,marketingmanagementsectorthroughsupervisionandinspectionfoundproblems,shouldbeassignedtheinvestigatorsarecorrectedinatimelymanner.27ththefifthchapterpenaltyunderanyofthefollowingacts,thentherelevantprovisionstopunishtheinvestigators,accordingtotheBank.Toconstituteacrimeshallbeinvestigatedforcriminalresponsibility:(A)onthebusinessthatarenotinvolvedintheinvestigation,issuedasurvey.(B)customercreditinformationarenotthoroughverification.(Iii)toparticipateincreditcustomersurveyisnotinplace,customersanddataisincomplete,untrue;heknowsbearacounterfeitedclientsissuingcredit.(D)doesnotprovideforduediligenceofcreditbusiness,pre-loaninvestigationform,concealingfactsorprovidingfalseinformationorshouldbefoundinanormalinvestigationfailedtodiscovertheriskfactors,leadtothereviewandapprovalpolicyerrors,loanrisk.(Five)onloanguaranteesofsurveynotinplace,notbyprovidesonarrived,andpledgerealforfieldverification,andassessment,andidentificationandregistration,notaccordingtoprovidesonguarantorofguaranteesqualificationandguaranteescapacityforsurveyverified,ledtoguaranteesloanlostauthenticity,andlegitimacy,andeffectivenessof;cycleloanbusinessintheofmortgage-3-8．2角的比较导学目标通过联想线段大小的比较方法，找到角的大小的比较方法。通过联想线段和、差、倍、分的作法，类比掌握角的和、差、倍、分的作法和计算。掌握角的平分线的定义以及数学表达式。培养学生类比联想的思维能力和对知识的迁移能力。学习重点和难点重点：角的两种比较方法、角的和、差、倍、分的作法和计算、角的平分线定义。难点：角平分线定义的各种数学表达式。教学过程一.新课导入：1．类比联想，提出问题前面学习了线段的概念之后，紧接着就学习了比较线段的大小以及线段的和、差、倍