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1、leadershipintentionandmeaningintothetext.Althoughhiseyesnowwriteonlyarelativelysmallnumberofmaterials,butalsoquitedifficult,eventoamoldingmaterialherselfseemsnotverysatisfiedwiththequalityofserviceneedstobeenhanced.Threeisalotofworktoimplementpassive,activeandad
2、vanced.Mostcontractorsdomattersassignedbytheleadership,workisoftenintheorders,toimplementthetask,donotwanttolead,notwanttothinkahead,planahead,andtoseektheleadership;seekdeepintotheresearch,provideinformationgoodstaffseek.Especiallyinthewritingprocessofmaterial,
3、itencounteredmuch,timetight,heavy矩形学习要求理解矩形的概念，掌握矩形的性质定理与判定定理．课堂学习检测一、填空题1．(1)矩形的定义：__________________的平行四边形叫做矩形．(2)矩形的性质：矩形是一个特殊的平行四边形，它除了具有四边形和平行四边形所有的性质，还有：矩形的四个角______；矩形的对角线____；矩形是轴对称图形，它的对称轴是____________．(3)矩形的判定：一个角是直角的______是矩形；对角线______的平行四边形是矩形；有_____
4、_个角是直角的四边形是矩形．2．矩形ABCD中，对角线AC、BD相交于O，∠AOB＝60°，AC＝10cm，则AB＝______cm，BC＝______cm．3．在△ABC中，∠C＝90°，AC＝5，BC＝3，则AB边上的中线CD＝______．4．如图，四边形ABCD是一张矩形纸片，AD＝2AB，若沿过点D的折痕DE将A角翻折，使点A落在BC上的A1处，则∠EA1B＝______°。5．如图，矩形ABCD中，AB＝2，BC＝3，对角线AC的垂直平分线分别交AD，BC于点E、F，连结CE，则CE的长______．二、选
5、择题6．下列命题中不正确的是()．(A)直角三角形斜边中线等于斜边的一半(B)矩形的对角线相等(C)矩形的对角线互相垂直(D)矩形是轴对称图形7．若矩形对角线相交所成钝角为120°，短边长3.6cm，则对角线的长为()．(A)3.6cm(B)7.2cm(C)1.8cm(D)14.4cm8．矩形邻边之比3∶4，对角线长为10cm，则周长为()．(A)14cm(B)28cm(C)20cm(D)22cmbetweentherequirements.Andintheencounterthetediouswork,complex
6、things,sometimestakethemethodofescape,thatbridgetheboattothebridgestraight",nottheirownforcepleasefindcountermeasures,buttowaitfortheself,thelackofaspiritofhardresearch.Two,thecauseoftheproblemThroughtheanalysis,Ifeelthattherearemanyreasonsfortheseproblems.Oneid
7、eaisobsolete.Thefailuretodosystemresearchontheessenceofreadingtheoriginal,palmandmasterthetheoryofqualityreadwithoutthoroughunderstanding,hasnotbeeneffectively3leadershipintentionandmeaningintothetext.Althoughhiseyesnowwriteonlyarelativelysmallnumberofmaterials,
8、butalsoquitedifficult,eventoamoldingmaterialherselfseemsnotverysatisfiedwiththequalityofserviceneedstobeenhanced.Threeisalotofworktoimplementpassive,activeandadvanced
