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如图，正方形ABCD中，AB＝2，O是BC边的中点，点E是正方形内一动点，OE＝2，连接DE，将线段DE绕点D逆时针旋转90°得DF，连接AE，CF．则线段OF长的最小值（ ）
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在正方形ABCD中点EFGH分别在边ABBCCDAD上四边形EFGH是矩形EF=2FG那么矩形EFG
已知在正方形ABCD中点E.是边BC的中点在边AB上任取一点F.则△ADF与△BFE的面积之比不小于
如图四边形ABCD是⊙O的内接正方形AB=4PCPD是⊙O的两条切线CD为切点.1如图1求⊙O的半径
如图正方形ABCD的对角线AC.BD相交于点O.E.是BC的中点DE交AC于点F.若DE=12则DF
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如图⊙O1的半径为1正方形ABCD的边长为6点O2为正方形ABCD中心O1O2⊥AB于P.点O1O2
如图所示四边形ABCD是正方形点E.是边BC的中点且∠AEF=90°EF交正方形外角平分线CF于点F
如图四棱锥Ｐ－ABCD四边形ABCD是正方形O.是正方形的中心E.是PC的中点且PA=AB=PB.1
在正方形ABCD中点E.F.G.H.分别在边ABBCCDAD上四边形EFGH是矩形EF=2FG那么矩
如图四边形ABCD是⊙O.的内接正方形P.是弧AB的中点PD与AB交于E.点则.
阅读理解如图1在四边形ABCD的边AB上任取一点E点E不与点A.点B重合分别连接EDEC可以把四边形
如图在正方形ABCD中点E.是边BC的中点直线EF交正方形外角的平分线于点F.交DC于点G.且AE⊥
如图1已知点E.F.G.H.分别是四边形ABCD各边ABBCCDDA的中点根据以下思路可以证明四边形
如图在正方形ABCD中E是BC边的中点把△ABE沿直线AE折叠点B的对应点为B′AB′的延长线交DC
如图正方形ABCD和正方形CEFG中点D.在CG上BC=1CE=3H.是AF的中点那么CH的长是
如图在正方形ABCD中点E.是边BC的中点直线EF交正方形外角的平分线于点F.交DC于点G.且AE⊥
如图扇形OMN与正方形ABCD半径OM与边AB重合弧MN的长等于AB的长已知AB=2扇形OMN沿着正
如图在正方形ABCD中连接BD点O.是BD的中点若M.N.是边AD上的两点连接MONO并分别延长交边
2对
3对
4对
5对
如图四棱锥Ｐ－ABCD四边形ABCD是正方形O.是正方形的中心E.是PC的中点且PA=AB=PB.1
在梯形ABCD中AD∥BCAB＝CD对角线ACBD交于点O.AC⊥BDE.F.G.H.分别是ABBC
如图1在正方形ABCD中EF分别是边ADDC上的点且AF⊥BE.1求证:AF=BE.2如图2在正方形
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8分ItwassaidthatinherfortiesRoseGreenstartedtolearnpaintingbyherselfandbecameoneofBritain'sbest﹣knownpainters.Shediedpeacefullyearliertodayattheageof81. Whatsheisfamousforispaintingacolorfulandfunnyworldoffatwomen.ThecomedianVictoriaWoodoncedescribedherasRubenswithjokes.DescribingherownworksheoncesaidIdon'tknowhowmypictureshappentheyjustdo. Herpicturesgainedalotoffansforher.Herfanshadlongbeenangrywiththemajorartgalleriesforfailingtonoticeherworkswhichsellforonly40000.In2008theystartedafightagainstTateModernfornotbuyingRose'spaintings.ButtowardstheendofherlifesheenjoyedwiderpraisewithamajorexhibitionlastyearattheBalticgalleryinGateshead.JessWilderco﹣ownerofLondon'sPortalGalleryhadshownherpaintingsformorethan30years. ShehasthreesistersandRoseleftschoolat14andin1943movedtoLondonandbecameashowgirlinasinginghall.In1946shemarriedherchildhoodfriendJohnwithwhomsheranabarforashorttime.TheirsonalsonamedJohnwasbornin1950andtheymovedtoSouthernRhodesiain1951﹣amovesaidtobeaturningpointforRose.Afterpickingupsomepaintsbelongingtohersonshebegancreatingpicturesonwood.ThefamilylatermovedtoPlymouthwhereinthesummermonthstheyranahotel. Alocalexhibitioninthemid﹣1970sattractedmanypeoplefollowedbyacoverintheSundayTimesmagazineandRose'sfirstLondonexhibition.In1979MelvynBraggmadeafilmaboutRose. 1WhatcanweknowaboutRoseGreen'spaintings? A.Theywereallboughtbyallkindsofartgalleries. B.Theyhelpedbringchildrenalotofhappiness. C.Theywereallfinishedwhenshewasyoung. D.Theyweremainlyaboutfatwomen. 2IntheopinionofRoseGreen'sfans. A.TateModernshouldbuyGreen'spaintings B.RoseGreen'sworksweresoordinarythatnogallerynoticedthem C.TateModernrefusedGreen'spaintingsfortheirbeingofnovalue D.RoseGreen'sworksweretooexpensivetobuy 3ItcanbeinferredthatonherwaytobeinganartistRoseGreen. A.gotalotofhelpfromherson B.madeafilmtosupportherlifeasanartist C.beganadifferentlifeaftermovingtoSouthernRhodesia. D.beganherlifeasafamousartistaftermovingtoPlymouth 4WhichofthefollowingistherightorderofRoseGreen'sexperiences? a.movedtoSouthernRhodesia b.becameashowgirlinasinginghall c.marriedJohn d.ranabar e.begancreatingpicturesonwood f.movedtoPlymouth A.b﹣d﹣f﹣e﹣a﹣c B.b﹣c﹣d﹣a﹣e﹣f C.a﹣d﹣e﹣f﹣b﹣c D.d﹣e﹣a﹣b﹣c﹣f
6分Moviemakersatonetimeworriedthattheymightbeputoutofbusinessbytelevision.Recentlyhowevermoreandmorepeoplehavebeengoingtothemovies.ThismaybepartlybecausetheeconomicsituationinAmericahasworsened.Whenatthemoviespeopleforgettheirtroublesastheygetinvolvedinthestoryonthescreen.Alsodirectorshaverecentlybeenproducingpicturesthatlargenumbersofpeoplewanttosee. Americansinthemillionsarereturningtotheirloveaffairwiththemovies.MotionpictureindustryexpertsseetwomainfactorsresponsibleforthisanincreasedneedbyAmericanstoescapefromeconomicworriesandalargenumberofnewmovieswithbroadaudienceappeal. Moviemakersadmitthattheirrisingpopularityispartlytheresultofpooreconomicconditionswhichtraditionallybringanincreaseintheaterattendance.WhenpeoplearefearfulaboutthefuturetheylookforescapecommentsJackValentipresidentoftheMotionPictureAssociationofAmerica.Inashadedtheaterwitha65﹣footscreenyouloseyourselffortwoandahalfhoursandpeoplefindthisbeneficial. 1Whatdidmoviemakersworryaboutbefore? A.Thatnoonewouldgotothecinema. B.Thatmoviescouldn'tbeabusinessanymore. C.Thattheirmoviesmightbeplayedontelevision. D.ThatpeoplepreferredwatchingTVtoseeingfilms. 2Whyaresomanypeoplegoingtoseemoviesnow? A.Becausepeoplenowhavemuchmoremoney. B.Becausepeoplehavetroubles. C.Becausepeoplewantedtoescapefromreallife. D.BecausewatchingmoviesisnowmuchcheaperthanwatchingTV. 3What'sthepassagemainlyabout? A.ThatmoreAmericanpeoplearewatchingmoviesthanbefore. B.Thattelevisionwilltaketheplaceofmovies. C.America'seconomicdepression. D.ThatAmericansprefertowatchmoviesratherthanwatchTV.
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若a+b＝﹣3ab＝2则a2+b2＝．
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如图AB是半圆O的直径点CD是半圆O的三等分点若弦CD＝6则图中阴影部分的面积为．
如图⊙O是四边形ABCD的外接圆．ACBD是四边形ABCD的对角线BD经过圆心O点E在BD的延长线上BA与CD的延长线交于点FDF平分∠ADE． 1求证AC＝BC 2若AB＝AF求∠F的度数 3若⊙O半径为5求DF的长．
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8分Nowadaysthereisaninterestingthinghappeningduringthecourseofthecommunicationsrevolutionswestoppedinpersontalkingtoeachother. RecentlyIwasinaparkhavingatalkwithagoodfriendandatthatmomenthissmartphoneranginterruptingourconversation.Therewewerewalkingandtalkingonabeautifulsunnydayand…Ibecameinvisibleabsentfromtheconversation. Thetelephonewhichusedtoconnectyoutotheabsentnowmakespeoplesittingclosetoyoufeelabsent.WhyisitthatthemoreconnectedwegetthemoredisconnectedIfeel?Everyadvanceincommunicationstechnologyisatragedytotheclosenessofhumaninteraction.WithemailandinstantmessagingovertheInternetwecannowcommunicatewithoutseeingortalkingtooneanother.Withvoicemailyoucanconductentireconversationswithouteverreachinganyone.IfmymomhasaquestionIjustleavetheansweronhermachine. Asalmosteverycontactwecanimaginebetweenhumanbeingsgetsautomatedwearenowfeelingmoredistantfromoneanother.Youcan'tevencallapersontogetthephonenumberofanotherpersonanymore.Directoryassistanceisalmostalwaysfullyautomated. Iamnotagainstmoderntechnology.IownacellphoneanATMcardavoicemailsystemandanemailaccount.Givingthemupisn'twise…they'reagreathelptouse.It'ssomeoftheirpossibleconsequencesthatmakemefeeluneasy. MoreandmoreIfindmyselfhidingbehinde﹣mailtodoajobmeantforconversationorbeingrelievedthatvoicemailpickedupbecauseIdidn'treallyhavetimetotalk.Theindustrydevotedtohelpingmekeepintouchismakingmelonelier. SoI'veputmyselfontechnologyrestrictionnoinstantmessagingwithpeoplewholivenearmenocellphoninginthepresenceoffriendsnolettingthevoicemailpickupwhenI'mathome. 1Whichofthefollowingwouldbethebesttitleofthepassage? A.TheAdvanceofCommunicationsTechnology. B.TheStoryofCommunicationsRevolution. C.TheConsequencesofModernTechnology. D.TheAutomationofModernCommunications 2Thesentencenowmakespeoplesittingclosetoyoufeelabsentmeansthat. A.thepeoplesittingbesideyouhavetogoawaytoreceiveaphonecall B.moderntechnologymakesithardforpeopletohaveaface﹣to﹣facetalk C.youcanhardlygetintouchwiththepeoplesittingbesideyou D.peoplecannowdotheirworkwithoutgoingtotheoffice 3Thewriterfeelsthattheuseofmoderncommunicationsis. A.embarrassing B.disappointing C.satisfying D.encouraging 4Thepassageimpliesthat. A.moderntechnologyisinterruptingourcommunications B.moderntechnologyisbridgingthepeople. C.moderntechnologyisdevelopingtoofast D.moderntechnologyisseparatingthepeople
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