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1、平面图形1.Lookatthefigureonright,weknowthelengthofthefourlines,andtwoanglesisninetydegrees.CanyouworkouttheareaofthequadrangleABCD?2.Lookatthefigureonright,thelengthofBD,DEandECis2,4and2,FisthemiddlepointoflineAE,thetriangleABCis4high,pleasecalculatetheareaoftriangleDE
2、F.3.Inthefollowingdiagram,weknowthelengthofthethreelines,MisthemiddlePointoflineDE,pleasecalculatetheareaofquarangleABMD(theshadedpart).4.Asisshowninthediagram,eachsideoftheexactsquare(正方形)equals1.pleasecalculatetheareaoftheshadedpart(阴影部分)？5.Lookattheshadowofthefo
3、llowingtwopartsAandBarea.Canyoufigureoutwhichpartisbigger?(thelengthofsidesinrectanglaraare3,4;andinrectangularBare2,6)6.Thelengthofexactsquare’ssideequals1.Pleasecalculatetheareaoftheshadedpart.181.Thelengthofthesidesinthefollowinggrasswhichisarectangleare16,10.An
4、dthereistworoadsinthemiddle,oneisarectangleoneisaparallelogram,thenwhatistheareaoftheshadedpart?2.Seekingthefollowinggraphicarea.3.Inthefollowingdiagram,largesquareareais10cm2largerthanthesmallsquarearea.Pleasecalculatetheareaofthecircle.4.Findoutwhichofthefollowin
5、gareaoftwotrianglesareequal?5.Thereisalittersquarewaterpool.Itis5meterslongeachside.Thereisgrassaroundthepooleverywhere.ThereisagoattiedtopointA,theropeis6meterslong.Howmanysquaremetersofgrasscanthegoatgetatmost?18专题五：立体图形一、长方体和正方体面积及体积计算：二、典型例题例1：2.1squaremeters=(
6、)squaredecimeters;2.14cubicmerters=()cubicdecimeters0.05cubicmerters=()liters=()milliliters.中文意思：________________________________________________________________________________________________________________________________________________答案： _______，_______，___
7、_____，_______。例2：Pleasetrytofigureoutthenumberofsurfaces,andthenumberoftheedgesinthefollowingdiagram.中文意思：___________________________________________________________Answer:______,_______.解析：surfaces:_______,edges_______.同学们自己填上中文意思哦。例3：Weneed_____________cubeswith5
8、cmsideatleasttomakeabiggercube.中文意思：___________________________________________________________例4：Thefloorspaceofacubeis2cm2,thenitsspaceareais__
