四年级下册数学课件-5.3 整理与提高：垂直与平行沪教版 (共17张PPT).pptVIP

1.问题：可以把这几组直线分分类吗？2.出示要求：①请在小组内交流如何分类。

②把你的分法用编号在练习本上记录下来。3.小组汇报。自学指导：不相交相交成直角在同一个平面内不相交的两条直线叫做平行线，也可以说这两条直线互相平行。不相交如果两条直线相交成直角，就说这两条直线互相垂直,其中一条直线叫做另一条直线的垂线，这两条直线的交点叫做垂足.判断下面哪组中的两条直线互相平行：1234互相平行观察下面几个图形，那个图形中的两条直线互相垂直1234ababab上图中a与b互相平行，记作：a∥b，读作：a平行于b。OabOab上图中直线a与b互相垂直，记作：a⊥b，读作：a垂直于b。Oab垂足问题：你能举一些生活中有关平行的例子吗？1.下面各组直线，哪一组互相平行？哪一组互相垂直？xycd按点Func0/FuncFuncName/FuncNameSubject/SubjectTerm/TermVersion/VersionVolumn/VolumnTextName/TextNameGoal/GoalGoalLevel-1/GoalLevelGoalId/GoalIdHard-1/HardActionStyle0/ActionStyleItemNum4/ItemNumScore0/ScoreSubScore0/SubScoreItemScore/ItemScoreAnswer4/AnswerNamePPT[按点]预设202821/NameActionMode0/ActionModeFastNum1/FastNumTimeLimit0/TimeLimitStrategy/StrategyThinkBack/ThinkBackDesign/DesignContent/ContentContentType-1/ContentTypeFontSize50/FontSizePic/PicPicMode0/PicModecCol7/cColcRow7/cRow/按点按点Func0/FuncFuncName/FuncNameSubject/SubjectTerm/TermVersion/VersionVolumn/VolumnTextName/TextNameGoal/GoalGoalLevel-1/GoalLevelGoalId/GoalIdHard0/HardActionStyle0/ActionStyleItemNum4/ItemNumScore0/ScoreSubScore0/SubScoreItemScore/ItemScoreAnswer2/AnswerNamePPT[按点]预设204120/NameActionMode0/ActionModeFastNum1/FastNumTimeLimit0/TimeLimitStrategy/StrategyThinkBack/ThinkBackDesign/DesignContent/ContentContentType-1/ContentTypeFontSize50/FontSizePic/PicPicMode0/PicModecCol7/cColcRow7/cRow/按点按点Func0/FuncFuncName/FuncNameSubject/SubjectTerm/TermVersion/VersionVolumn/VolumnTextName/TextNameGoal/GoalGoalLevel-1/GoalLevelGoalId/GoalIdHard0/HardActionStyle0/ActionStyleItemNum2/ItemNumScore0/ScoreSubScore0/SubScoreItemScore/ItemScoreAnswer2/AnswerNamePPT[按点]预设204708/NameActionMode0/ActionModeFastNum1/FastNumTimeLimit0/TimeLimitStrategy/StrategyThinkBack/ThinkBackDesign/DesignContent/ContentContentType-1/ContentTypeFontSize50/FontSizePic/PicPicMode0/PicModecCol7/cColcRow7/cRow/按点按点Func0/FuncFuncName/FuncNameSubject/SubjectTerm/TermVersion/VersionVolumn/VolumnTextNam