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如图,在△ABC中,∠BAC=90°,D是BC的中点,E是AD的中点,过点A作AF∥BC交BE的延长线于点F,连接CF. (1)求证:△AEF≌△DEB; (2)证明四边形ADCF是菱形.
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如图Rt△ABC中∠ABC=90°以AB为直径作半圆⊙O交AC与点D点E为BC的中点连接DE.⑴求证
如图△ABC中AB=AC=6BC=8AE平分∠BAC交BC于点E.点D.为AB的中点连接DE则△BD
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1如图1在△ABC中点M.为BC边的中点且MA=BC求证∠BAC=90°.2如图2直线ab相交于点A
如图在△ABC中∠BAC=90°AB=AC点D.为边AC的中点DE⊥BC于点E.连接BD则tan∠D
如图在△ABC中∠BAC=90°M.是BC的中点过点A.作AM的垂线交CB的延长线于点D.求证△DB
如图在△ABC中D.是BC的中点DE⊥AB于E.DF⊥AC于点F.且BE=CF.求证AD平分∠BAC
1如图在△ABC中∠BAC=90°AB=AC点D.在BC上且BD=BA点E.在BC的延长线上且CE=
如图所示在三棱锥S.—ABC中SO⊥平面ABC侧面SAB与SAC均为等边三角形∠BAC=90°O.为
如图在Rt△ABC中∠ABC=90°以AB为直径作半圆⊙O交AC于点D.点E.为BC的中点连接DE.
在△ABC中∠BAC=90°AB=6D.为斜边BC的中点则的值为__________
在△ABC中AB=AC点F.是BC延长线上一点以CF为边作菱形CDEF使菱形CDEF与点A.在BC的
如图在△ABC中∠BAC=90°PA⊥面ABCAB=ACD.是BC的中点则图中直角三角形的个数是
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在△ABC中∠C.=90°M.是BC的中点.若sin∠BAM=则sin∠BAC=________.
如图△ABC中∠BAC=90°AB=AC点D.是斜边BC的中点DE⊥DF若AB=8cm则四边形AED
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如图Rt△ABC中∠BAC=90°D.E.F.分别为ABBCAC的中点已知DF=3则AE=.
如图所示在△ABC中∠BAC=90°D.是BC中点AE⊥AD交CB延长线于E.点则下列结论正确的是
△AED∽△ACB
△AEB∽△ACD
△BAE∽△ACE
△AEC∽△DAC
如图①在△ABC中∠ABC=60°∠BAC=90°AD是BC边上的高.沿AD把△ABD折起得如图②所
如图△ABC中∠BAC=90°AB=AC点D.是斜边BC的中点DE⊥DF若AB=8cm则四边形AED
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如图△ABC中AB=ACD.是BC中点下列结论中不正确的是
∠
=∠
B.AD⊥BC C.AD平分∠BAC
AB=2BD
如图△ABC中AB=AC=5BC=6AE平分∠BAC交BC于点E.点D.为AB的中点连结DE则△BD
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春天来了我们期待着一起去郊游. Springiscoming.Weaschoolouting.
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Twomenbothseriouslyillsharedthesamehospitalroom.Onemanwasallowedtositupinhisbedforanhoureachafternoon.Hisbedwasnexttotheonlywindowoftheroom.Theothermanhadtospendallhistimeflatonhisback.Thementalkedforhoursonend.Theyspokeoftheirwivesandfamiliestheirhomestheirjobstheirexperienceinthearmyandwheretheyhadbeenonvacation.Everyafternoonwhenthemaninthebedbythewindowcouldsituphewouldpassthetimebydescribingtohisroommateallthethingshecouldseeoutsidethewindow.Themanintheotherbedbegantoliveforthoseone﹣hourperiodswhenhisworldwouldbebroadenedandenlivenedbyalltheactivitiesandcolorsoftheworldoutside. Thewindowoverlookedaparkwithalovelylake.Ducksandswansplayedonthewaterwhilechildrensailedtheirmodelboats.Youngloverswalkedarminarmamongflowersofeverycolor.Grandoldtreesmadeeverythingaroundmoreattractiveandafineviewofthecityskylinecouldbeseeninthedistance.Asthemanbythewindowdescribedallthisingreatdetailthemanontheothersideoftheroomwouldclosehiseyesandimaginethepicturesquescene.Onewarmafternoonthemanbythewindowdescribedaparadepassingby.Althoughtheothermancouldn'thearthebandhecouldseeitinhismind'seyeasthegentlemanbythewindowpictureditwithdescriptivewords. Daysandweekspassed.Onemorningthedaynursearrivedtobringwaterfortheirbathsonlytofindthelifelessbodyofthemanbythewindowwhohaddiedpeacefullyinhissleep.Shewassaddenedandcalledthehospitalattendantstotakethebodyaway.Assoonasitseemedappropriatetheothermanaskedifhecouldbemovednexttothewindow.Thenursewashappytomaketheswitchandaftermakingsurehewascomfortableshelefthimalone.Finallyhewouldhavethejoyofseeingitforhimself. 注意: 1.所续写短文的词数应为150左右; 2.使用5个以上短文中标有下划线的关键词语; 3.续写部分分为两段每段的开头语已为你写好; 4.续写完成后请用下划线标出你所使用的关键词语. Paragraph1: Slowlyandpainfullyhemadehisgreatestpossibleeffortstolookoutofthewindowbesidethebed. Paragraph2: Themanwasblindandcouldnotevenseethewall.Perhapshejustwantedtoencourageyou.thenurseanswered.
UnderwaterMuseums Manyunderwatermuseumsaresupportedbycompaniesthatofferguidedtours.Atrainedguideleadsgroupsaroundastrikingunderwaterdisplayofstatuesineachmuseum.Dependingonthedepthofthemuseumvisitorsmaybeabletoviewthesculpturesfromtheglass﹣bottomedboatorbyswimmingonthesurface.Otherunderwatermuseumsaredeeperandaremostaccessibletoscubadivers. Underwatermuseumshavemanyfunctions.Oneoftheirmainpurposesistocreateanartificialreefenvironmentwhereseacreaturescanlive.That'swhysomeofthemuseumsarelocatedinareasthatweredamagedbyhurricanesorareconsideredunderwaterdeserts.Thestatuesinthemuseumaredesignedinawaythatencouragesthegrowthofcoralandplantlife.Overtimethestatuesandplantsattractmoreandmorefishtothearea. FloridaU.S.A Floridaishometodifferenttypesofunderwatermuseums.Thestate'snewestunderwatermuseumtheUnderwaterMuseumofArtcanbefoundoffthecoastofGraytonBeach.ThispartoftheGulfofMexicoisanunderwaterdesertsocreatorshopethattheexhibitwillimprovethemarineecosystem. CancunMexico ForyearsCancunhasbeenapopulartouristdestination.Andoneofthemajordrawsisthewater.TheMuseoSubacuaticodeArteisanidealplaceforsnorkelersandfirst﹣timedivers.Theretheycanenjoymorethan500statuesthathelptomakeupanartificialreef.Thismuseumwascreatedtogivevisitorsanalternativeattractiontothearea'snaturalreefwhichhasbeendamaged. CanaryIslandsSpain MuseoAtlantiooffthecoastofLanzarotehasanimpressivedisplayofmorethan300statues.TheywerecreatedbyJasonDecairesTayloraBritishsculptorwhohascontributedtothecreationofseveralunderwatermuseumsincludingtheonesnearCancunandtheCanaryIslands.TheCancunstatuesfocusonman'sinteractionwiththemarineworld.Ifyou'relookingforadifferentmuseumexperiencecheckoutonethat'sunderwater. 1Inunderwatermuseumsvisitorscanseethefollowingthingsexcept. A.statues B.deserts C.reefs D.sculptures 2Accordingtothepassagewhichofthefollowingstatementsistrue? A.Underwatermuseumscannotbevisitedthroughguidedtours. B.Underwatermuseumsarealllocatedinareasdamagedbyhurricane. C.Underwatermuseumscanbeviewedallovertheworld. D.Underwatermuseumscanhelpimproveunderwaterenvironments. 3Wecanlearnfromthepassagethat. A.over300statuescanbeseenintheUnderwaterMuseumofArt B.naturalreefhasn'tbeendamagedinCancun C.thestatuesofCancunandtheCanaryIslandsaremadebythesamesculptor D.plantlifecan'tgrowinunderwatermuseums 4Whereisthetextprobablytakenfrom? A.Apersonaldiary. B.Atouristguidebook. C.Anofficialreport. D.Ahotelbrochure.
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