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时间:2021-04-16
《最新公开课特殊的四边形模板教学讲义PPT.ppt》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、公开课特殊的四边形模板特殊四边形6.四个角都是90°5.对角线互相平分3.对角相等2.对边相等1.对边平行4.邻角互补7.对角线相等9.对角线互相垂直8.邻边相等10.对角线平分各内角平行四边形矩形菱形正方形性质性质性质性质特殊的平行四边形的性质:ABCDEFGH5.依次连接任意四边形四边中点所得的图形叫做中心四边形。如图,四边形EFGH为中心四边形,问四边形EFGH是什么图形?添加条件一:AC=BD添加条件二:AC⊥BD添加条件三:AC=BD且AC⊥BD6.正方形ABCD中,点E,F,M,N分别在AB,BC,CD,DA上,且AE=BF=CM=DN.求
2、证:四边形EFMN是正方形。思考题:在正方形ABCD所在平面上有点P,使△PAB,△PBC,△PCD,△PDA均为等腰三角形。试问,具有这样性质的点P有多少个?为什么?ACDBPABCDEFGH家庭作业:我们知道,依次连接任意四边形四边的中点我们可以得到平行四边形。回答下列问题1.依次连接平行四边形四边中点,能得到的中心四边形是形。2.依次连接矩形四边的中点,能得到的中心四边形是形。3.依次连接菱形四边的中点,能得到的中心四边形是形。谢谢关系副词引导的定语从句1.when指时间,在定语从句中作时间状语。IstillrememberthedaywhenI
3、firstcametothisschool.Thetimewhenwegottogetherfinallyarrived.October1,1949wasthedaywhenthePeople’sRepublicofChinawasfounded.Doyouremembertheyearswhenhelivedinthecountrysidewithhisgrandparents.2.where指地点,在定语从句中作地点状语。ShanghaiisthecitywhereIwasborn.Ivisitedthefarmwherealotofcowswer
4、eraised.ThehousewhereIlivedtenyearsagohasbeenpulleddown.Isthistheplacewheretheyfoughttheenemy?3.why指原因,在定语从句中作原因状语。Pleasetellmethereasonwhyyoumissedtheplane.Thereasonwhyhewaspunishedisunknowntous.Idon’tknowthereasonwhyhelooksunhappytoday.Kunmingisabeautifulplace______flowersares
5、eenalltheyearround.Kunmingisabeautifulplace______iscalledtheCityofSpring.Kunmingisabeautifulplace______manywritersmentionedintheirbook.注意:关系副词引导的定语从句经常可以用“介词+关系代词”引导的定语从句来表示。when=on(in,at,during…)+which;where=in(at,on…)+which;why=forwhich.如:IwasinBeijingonthedaywhen(=onwhich)hea
6、rrived.Theofficewhere(=inwhich)heworksisonthethirdfloor.Thisisthechiefreasonwhy(=forwhich)wedidit.-17-定语从句关系词的判断方法①ThisisthemountainvillagewhereIstayedlastyear.Thisisthemountainvillage(which)Ivisitedlastyear.②I’llneverforgetthedayswhenIworkedtogetherwithyou.I’llneverforgettheday
7、s(which)Ispentwithyou.-18-Thereason__________youexplainedtotheteacherisgroundless.Thereason__________hedidn’tshowupwasthathewasstuckinthetrafficjam.2、关系代词和关系副词的比较1、Doyoustillrememberthechickenfarm_____wevisitedthreemonthsago?A.whereB.whenC.thatD.what2、Thereweredirtymarksonhertro
8、users______shehadwipedherhands.A.whereB.whichC.
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