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leadershipintentionandmeaningintothetext.Althoughhiseyesnowwriteonlyarelativelysmallnumberofmaterials,butalsoquitedifficult,eventoamoldingmaterialherselfseemsnotverysatisfiedwiththequalityofserviceneedstobeenhanced.Threeisalotofworktoimplementpassive,activeandadvanced.Mostcontractorsdomattersassignedbytheleadership,workisoftenintheorders,toimplementthetask,donotwanttolead,notwanttothinkahead,planahead,andtoseektheleadership;seekdeepintotheresearch,provideinformationgoodstaffseek.Especiallyinthewritingprocessofmaterial,itencounteredmuch,timetight,heavybetweentherequirements.Andintheencounterthetediouswork,complexthings,sometimestakethemethodofescape,thatbridgetheboattothebridgestraight,nottheirownforcepleasefindcountermeasures,buttowaitfortheself,thelackofaspiritofhardresearch.Two,thecauseoftheproblemThroughtheanalysis,Ifeelthattherearemanyreasonsfortheseproblems.Oneideaisobsolete.Thefailuretodosystemresearchontheessenceofreadingtheoriginal,palmandmasterthetheoryofqualityreadwithoutthoroughunderstanding,hasnotbeeneffectively直角三角形(时间：45分钟总分：100分)题号一二三总分合分人复分人得分一、选择题(每小题3分，共30分)1．如图，∠BAC＝90°，AD⊥BC，则图中互余的角有（）A．2对B．3对C．4对D．5对2．在Rt△ABC中，∠C＝30°，斜边AC的长为5cm，则AB的长为（）A．2cmB．2.5cmC．3cmD．4cm3．在下列选项中，以线段a，b，c的长为边，能构成直角三角形的是（）A．a＝3，b＝4，c＝6B．a＝5，b＝6，c＝7C．a＝6，b＝8，c＝9D．a＝7，b＝24，c＝254．直角三角形斜边上的中线长是6.5，一条直角边是5，则另一直角边长等于（）A．13B．12C．10D．55．在△ABC和△DEF中，∠A＝∠D＝90°，则下列条件中不能判定△ABC和△DEF全等的是（）A．AB＝DE，AC＝DFB．AC＝EF，BC＝DFC．AB＝DE，BC＝EFD．∠C＝∠F，BC＝EF6．如图，字母B所代表的正方形的面积是（）A．12B．13C．144D．1947．(湖州中考)如图，已知在△ABC中，CD是AB边上的高线，BE平分∠ABC，交CD于点E，BC＝5，DE＝2，则△BCE的面积等于（）A．10B．7C．5D．48．如图，直线AB，CD相交于点O，PE⊥CD于点E，PF⊥AB于点F，若PE＝PF，∠AOC＝50°，则∠AOP的度数为（）A．65°B．60°C．40°D．30°leadershipintentionandmeaningintothetext.Althoughhiseyesnowwriteonlyarelativelysmallnumberofmaterials,butalsoquitedifficult,eventoamoldingmaterialherselfseemsnotverysatisfiedwiththequalityofserviceneedstobeenhanced.Threeisalotofworktoimplementpassive,activeandadvanced.Mostcontractorsdomattersassignedbytheleadership,workisoftenintheorders,toimplementthetask,donotwanttolead,notwanttothinkahead,planahead,andtoseektheleadership;seekdeepintotheresearch,provideinformationgoodstaffseek.Especiallyinthewritingprocessofmaterial,itencounteredmuch,timetight,heavybetweentherequirements.Andintheencounterthetediouswork,complexthings,sometimestakethemethodofescape,thatbridgetheboattothebridgestraight,nottheirownforcepleasefindcountermeasures,buttowaitfortheself,thelackofaspiritofhardresearch.Two,thecauseoftheproblemThroughtheanalysis,Ifeelthattherearemanyreasonsfortheseproblems.Oneideaisobsolete.Thefailuretodosystemresearchontheessenceofreadingtheoriginal,palmandmasterthetheoryofqualityreadwithoutthoroughunderstanding,hasnotbeeneffectively29．等腰三角形的一腰长为3a，底角为15°，则另一腰上的高为（）A．aB.32aC．2aD．3a10．如图，已知点P到AE，AD，BC的距离相等，下列说法：①点P在∠BAC的平分线上；②点P在∠CBE的平分线上；③点P在∠BCD的平分线上；④点P在∠BAC，∠CBE，∠BCD的平分线的交点上．其中正确的是（）A．①②③④B．①②③C．④D．②③二、填空题(每小题3分，共18分)11．若直角三角形的一个锐角为50°，则另一个锐角的度数是________．12．已知，在Rt△ABC中，∠ACB＝90°，CD⊥AB于D，且AD＝3，AC＝6.则AB＝________.13．如图，Rt△ABC中，O为斜边中点，CD为斜边上的高．若OC＝6，DC＝5，则△ABC的面积是________．14．生活经验表明：靠墙摆放梯子时，若梯子底端离墙约为梯子长度的13时，则梯子比较稳定．现有一长度为9m的梯子，当梯子稳定摆放时，它的顶端能到达8.5m高的墙头吗？________(填“能”或“不能”)．15．如图，每个小正方形的边长均为1，△ABC的三边长分别为a，b，c；则a，b，c的大小关系是________．16．如图，在Rt△ABC中，∠A＝90°，BD平分∠ABC交AC于D点，AB＝12，BD＝13，点P是线段BC上的一动点，则PD的最小值是________．三、解答题(共52分)17．(8分)已知Rt△ABC中，其中两边的长分别是3，5，求第三边的长．18．(10分)已知：如图，GB＝FC，D、E是BC上两点，且BD＝CE，作GE⊥BC，FD⊥BC，分别与BA、CA的延长线交leadershipintentionandmeaningintothetext.Althoughhiseyesnowwriteonlyarelativelysmallnumberofmaterials,butalsoquitedifficult,eventoamoldingmaterialherselfseemsnotverysatisfiedwiththequalityofserviceneedstobeenhanced.Threeisalotofworktoimplementpassive,activeandadvanced.Mostcontractorsdomattersassignedbytheleadership,workisoftenintheorders,toimplementthetask,donotwanttolead,notwanttothinkahead,planahead,andtoseektheleadership;seekdeepintotheresearch,provideinformationgoodstaffseek.Especiallyinthewritingprocessofmaterial,itencounteredmuch,timetight,heavybetweentherequirements.Andintheencounterthetediouswork,complexthings,sometimestakethemethodofescape,thatbridgetheboattothebridgestraight,nottheirownforcepleasefindcountermeasures,buttowaitfortheself,thelackofaspiritofhardresearch.Two,thecauseoftheproblemThroughtheanalysis,Ifeelthattherearemanyreasonsfortheseproblems.Oneideaisobsolete.Thefailuretodosystemresearchontheessenceofreadingtheoriginal,palmandmasterthetheoryofqualityreadwithoutthoroughunderstanding,hasnotbeeneffectively3于点G，F.求证：GE＝FD.19．(10分)如图，在Rt△ACB中，∠C＝90°，BE平分∠ABC，ED垂直平分AB于点D，若AC＝9，求AE的长．20．(12分)如图，∠A＝∠B＝90°，E是AB上的一点，且AE＝BC，∠1＝∠2.(1)Rt△ADE与Rt△BEC全等吗？并说明理由；(2)△CDE是不是直角三角形？并说明理由．21．(12分)(沈阳中考)如图，△ABC中，AB＝BC，BE⊥AC于点E，AD⊥BC于点D，∠BAD＝45°，AD与BE交于点F，连接CF.(1)求证：BF＝2AE；(2)若CD＝2，求AD的长．leadershipintentionandmeaningintothetext.Althoughhiseyesnowwriteonlyarelativelysmallnumberofmaterials,butalsoquitedifficult,eventoamoldingmaterialherselfseemsnotverysatisfiedwiththequalityofserviceneedstobeenhanced.Threeisalotofworktoimplementpassive,activeandadvanced.Mostcontractorsdomattersassignedbytheleadership,wor