首页
试卷库
试题库
当前位置:
X题卡
>
所有题目
>
题目详情
如图,点C是以AB为直径的⊙O上一点,CP与AB的延长线相交于点P,已知AB=2BP,AC=BP. (1)求证:PC与⊙O相切; (2)若⊙O的半径为3,求阴影部分弓形的面积.
查看本题答案
包含此试题的试卷
教案备课库《》真题及答案
点击查看
你可能感兴趣的试题
如图已知⊙O是△ABC的外接圆AB是⊙O的直径D.是AB的延长线上的一点AE⊥DC交DC的延长线于点
如图AB为⊙O的直径C是⊙O上一点D在AB的延长线上且∠DCB=∠A.求证CD是⊙O的切线.
如图已知AB为⊙O的直径C.为⊙O上一点F为的中点过F.作DE∥BC交AB的延长线于D.交AC的延长
在⊙O.中AB为直径C.为⊙O.上一点.Ⅰ如图①过点C.作⊙O.的切线与AB的延长线相交于点P.若∠
如图BC是⊙O.的直径A是⊙O.上一点过点C.作⊙O.的切线交BA的延长线于点D.取CD的中点E.A
如图点D是⊙O直径CA的延长线上一点点B在⊙O上且AB=AD=AO 1求证BD是⊙O的切线
在⊙O.中AB为直径C为⊙O.上一点.Ⅰ如图1过点C.作⊙O.的切线与AB的延长线相交于点P若∠CA
A.选修4-1几何证明选讲如图⊙O.的直径AB的延长线与弦CD的延长线相交于点P.E.为⊙O.上一点
A.选修4-1几何证明选讲如图⊙O.的直径AB的延长线与弦CD的延长线相交于点P.E.为⊙O.上一点
如图所示△ABC的外接圆圆心O.在AB上点D.是BC延长线上一点DM⊥AB于M.交AC于N.且AC=
如图BC是⊙O.的直径A.是⊙O.上一点过点C.作⊙O.的切线交BA的延长线于点D.取CD的中点E.
如图BC是⊙O的直径A是⊙O上一点过点C作⊙O的切线交BA的延长线于点D取CD的中点EAE的延长线与
如图C.是以AB为直径的⊙O.上一点过O.作OE⊥AC于点E.过点A.作⊙O.的切线交OE的延长线于
如图⊙O.的直径AB=6cmD.为⊙O.上一点∠BAD=30°过点D.的切线交AB的延长线于点C.求
如图在△ABC中∠BAC=30°以AB为直径的⊙O.经过点C.过点C.作⊙O.的切线交AB的延长线于
如图BC是⊙O.的直径A.是⊙O.上一点过点C.作⊙O.的切线交BA的延长线于点D.取CD的中点E.
A.选修4-1几何证明选讲如图⊙O.的直径AB的延长线与弦CD的延长线相交于点P.E.为⊙O.上一点
如图⊙O.是△ABC的外接圆AB是⊙O.的直径D.是AB的延长线上的一点AE⊥DC交DC的延长线于点
如图⊙O.的直径AB的延长线与弦CD的延长线相交于点P.E.为⊙O.上一点AE=AC求证∠PDE=∠
如图AB为⊙O.直径C.是⊙O.上一点CO⊥AB于点O.弦CD与AB交于点F.过点D.作⊙O.的切线
热门试题
更多
如图所示电源电压为12V滑动变阻器的最大阻值为42Ω电流表的量程为0﹣0.6A电压表的量程为0﹣9V当开关S和S1都闭合滑动变阻器的滑片P移至A点时灯泡正常发光滑动变阻器消耗的功率为3W当S闭合S1断开滑动变阻器的滑片P移至B点时灯泡消耗的功率是额定功率的定值电阻R1的功率是灯泡额定功率的此时滑动变阻器的功率是1.875W灯丝的电阻不变求 1电流表前后两次示数之比 2灯泡的额定电压 3RA和RB的值 4电路中总功率的最大值和最小值.
图a所示电路当闭合开关S后两个电压表指针偏转均为图b所示则电阻R1和R2两端的电压分别为
40分Ahumpbackwhaleisstrugglinghardinthesea.Thehumpbackscanweigh40tonsandstretch50feelfromnosetotail.That'sthekindof1andsizethateasilyoverturnsmallboats.Tojumpontothe2ofoneofthesegiantsis3toresultinadisaster.Butthat'sjustwhatSamSynsleliendidwhenhesawahumpback4caughtinaropethatwas5toabuoy浮标inCentralCaliforniansMorroBaythisweek. SamalongwithcrewmateNicholasTaronhadalreadytried6theunfortunatewhaletotheU.S.CoastGuard一buttheyweretolditwouldbehoursbefore7couldbesent.8thecommercialfishermen9thiswhaledidn'thave.Ifthewhalewasto10theyhadtogogetit.Therewasnoother11forthewhale.Theydecidedtogoforittotally12thefear.Turon's13intherescuewasmostlyinthe14cheeringdepartment.Intheclipyoucanhearhimdirectingtheoperationfromthesideoftheboatwhilefilmingtheentire15. Swim!Swim!HeyellsMove!Justgetit!Getit! Theanxiouswhalewasjustswimmingincounter﹣clockwisecircles16andbeingheldtothebottom.Itthrewitsheavytailagainsttheboat.ButSam17itandjumpedontothewhale'sbacktosaveitslife.Hemanagedtohanginthere18cuttingthroughtheropethat19thecreature.Andthenwithawhoosh击水声itdovedeepdownbeneaththegreat20.Itwasn'tmuchofathankyoubutSynstelienandTaronwereleftwithawhaleofatale. 1A.length B.violence C.ability D.weight 2A.nose B.head C.back D.tail 3A.willing B.likely C.anxious D.flexible 4A.hopelessly B.loosely C.curiously D.secretly 5A.stuck B.directed C.adjusted D.attached 6A.shipping B.delivering C.reporting D.hunting 7A.boats B.rescuers C.fishermen D.experts 8A.Strength B.Advantages C.Patience D.Hours 9A.figured B.objected C.hesitated D.proved 10A.paddle B.survive C.relax D.breathe 11A.barrier B.accommodation C.option D.equipment 12A.hiding B.exhibiting C.fostering D.ignoring 13A.interest B.ambition C.role D.contribution 14A.disturbing B.enthusiastic C.clumsy D.scared 15A.operation B.creature C.performance D.fighting 16A.silent B.stressed C.confused D.unconscious 17A.wrestled B.spotted C.trained D.approached 18A.eventually B.naturally C.directly D.normally 19A.prohibited B.injured C.tied D.monitored 20A.waves B.noises C.ferry D.darkness
为进行估测家用电器的功率小强首先观察了家中的电子式电能表表盘上标有“3000imp/kW•h”的字样然后他只让电视机工作发现电视机工作5min电能表指示灯闪烁了20次则该电视机在上述时间内消耗的电能是J该电视机的实际功率是W.
10分假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. Myfatherisapoliceman.Onacoldwintereveninghesawoldbeggarsittinginasquareoutsideashoppingcenter.Hisshoeshadbeenwornoutandhistoesstickout.Seehisfrozenfeetmyfatherfeltsad.Heleftandreturnedbackwithapairofnewshoesandsocksthatheboughtatanearbystore.Hekneltdownonthegroundbuthelpedtheoldhomelessmanputiton.Hisrandomactofkindnessmeltedtheheartsofthepasser﹣by.Awomanbroughtanoldblanketfromherhousetoprotectthebeggarwiththefreezingcold.Thebeggarwastouchedandsaiditwasnicetoknowthatangelstruewalkonearth.
某种型号吹风机接入电路中可以吹出冷风或热风使用时闭合“冷风”开关吹出冷风再闭合“热风”开关吹出热风.但只闭合“热风”开关电吹风机不会工作该电吹风的电路图是
小虎和同学们在资江河畔考察水污染情况时捡到一块黑色的小石头.好奇的小虎回到学校后用天平和量筒对小石头的密度进行了测量. 1他在调节天平横梁平衡时发现指针偏向分度盘中央刻度线的左侧如图甲所示.为使横梁水平平衡他应将平衡螺母向选填“左”或“右”端调. 2在测量过程中他先用调节好的天平测量小石头的质量天平平衡时右盘中砝码的质量及游码在标尺上的位置如图乙所示.然后用量筒测量小石头的体积如图丙所示则小石头的体积是cm3. 3小石头的密度是g/cm3.
在昼夜明灯的地下停车场驾驶员根据车位入口上方的红绿灯入停.如图是小吴设计的自动控制电路图将光控开关遮光时开关闭合装在每个车位地面中央红绿灯装在车位入口上方.当车位未停车时绿灯亮当车位已停车时红灯亮则图中L1L2
如图所示是小梦探究音调与什么因素有关的实验将钢尺的一端伸出桌面用手拨动钢尺使其上下振动发出声音.下列说法不正确的是
8分IvisitedElbalastJunejoiningMaryandJohnonabicyclingvacation.Theymadethearrangementsforthecarhotelandbicycles.IstudiedthehistoryoftheislandwhichofcourseparticularlyfeaturesNapoleon. NapoleonnowIknowpickedElbaasaplaceforpeacewhenhewasforcedtogiveupthethrone王权asEmperorofFrancein1814.FarfrombeingaprisonislandElbaisbeautifulwithtoweringmountainsthickforestsandsweepingbaysandbeaches. Itisalsoanislandfilledwithtreasure.Veryearlyonthisislandlocalsdiscoveredrichdepositsofiron.Soonoutsiderstoodiscoveredtheironand150othervaluablemineralsonthislittlepieceofland.LongbeforeEtruscansandotherGreekssetfootonitDorianshadmovedinbythetenthcenturyB.C.andwereminingtheisland.TheRomansrulednextobtainingthemineralsandbuildinggrandhousesoverlookingthesea.FromthetwelfthcenturyuntilthenineteenththeislandwastradedbackandforthandwaspassedtoFrancein1802.ThencameNapoleonthenewrulerofElba. IwaseagertovisithishouseinPortoferraio.TheEmperorlivedwithhiscourtandhismotherbuthiswifeMarieLouisehadensconcedherselfinthesplendidViennesepalaceofherfatherEmperorofAustria.Shelivedsafelythereandshowedlittleinterestinvisitingherhusbandinhismini﹣kingdom.ApparentlyNapoleonwasn'ttroubledmuchbythis.Hewastoobusyridingeverywhereonhorsebackbuildingroadsmodernizingagricultureandaboveallsharpeninghistinyarmyandnavyintoreadinessforhisescape. IntheformalgardensbehindthehouseitseemedtomethatIcouldimaginetheexiled流放的conqueror'sanxiousthoughts.HemightgazeoverwhereIstoodnowtowardthelighthouseoftheStellafortthesandybayandacrossitthegreenmountainsoftheTuscancoast.NapoleonspentonlytenmonthsherebeforemakinghisvictoriousreturntoFranceandthethrone. 1WhatdidtheauthordoforthevisittoElba? A.Hedidresearchonitspast. B.Hearrangedtransportation. C.Heplannedbicyclingroutes. D.Hebookedaccommodation. 2WhomightbetheearliestoutsiderstoElbaaccordingtothetext? A.Napoleonandhisarmy. B.EtruscansandotherGreeks. C.Dorians. D.Romans. 3Whatdoestheunderlinedwordensconcedprobablymean? A.Settled. B.Locked. C.Cured. D.Controlled. 4Whatcametotheauthor'smindduringhisvisittoNapoleon'sgardens? A.BeautifulviewsonElba. B.TerriblelivingconditionsonElba. C.Napoleon'sambitiontoregainpower. D.HardshipofNapoleon'sreturntoFrance.
2017年4月22日“天宫二号”与“天舟一号”成功对接天宫二号空间实验室是继天宫一号后中国自主研发的第二个空间实验室.下列有关说法中错误的是
如图所示当两根用毛皮摩擦过的带电硬橡胶棒相互靠近时下列说法正确的是
15分TheForbiddenCityinBeijinghometothePalaceMuseumhousesmorethan1.8millionculturalrelicsandisoneoftheworld'smostvisitedtouristattractions. 1markthe600thanniversaryoftheForbiddenCitythePalaceMuseumwillholdaseriesofeventsthroughout2020.Over20exhibitionswillbeheld2coverdifferentareassuchashistoryartfestivalsandsoon.ForthespecialoccasionAlongtheRiverduringtheQingmingFestivaloneofChina'smost3wideknownmasterpieceswillgoondisplayinSeptember2020.For4itbestpreservationthistreasuredartworkisseldomfullyexhibited.Thepainting5displayforthefirsttimebackin2005tocelebratethemuseum's80thanniversary.Such6raresightisexpectedtodrawhugecrowds.Inadditionthemuseumwillalsodisplayexhibitsfromother7country. DuringthepastfewyearsthePalaceMuseumhasbeenworkinghardtogetthepublicfamiliar8thehistoryandcultureoftheForbiddenCity.Anditseemsthattheseeffortshavebeenpayingoffwithits9popularreachinganewheight.Over17millionpeoplevisitedthemuseumin2018of1040percentwereunder30yearsold.
下列关于内能的说法中正确的是
关于能源与可持续发展下列认识中正确的是
图a是天平调节前的情形图b是天平调节平衡后称量物体质量时砝码及游码的示数下列说法正确的是
为了便于观察或减小误差我们在实验中需要对实验方案进行优化改进下列采取的措施不合理的是
25分假定你是李华你们学校的英国交换生Jeff准备参加外国人讲中国成语idiom故事比赛他发邮件请你给予辅导.你回复邮件内容包括 1.答应帮助 2.提出建议 3.询问辅导时间与地点. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯. DearJeff Yours LiHua
如图甲所示是探究平面镜成像特点的实验.小明实验过程如下 1a.在水平桌面上铺一张白纸纸上竖立一块玻璃板在纸上记录玻璃板的位置 b.点燃蜡烛放在玻璃板前看到它在玻璃板后面的像在纸上记录蜡烛的位置A1 c.拿另一支完全相同的没有点燃的蜡烛放在玻璃板的后方移动到某一位置时发现该蜡烛与被点燃的蜡烛的像重合这说明物和像的大小选填“相等”或“不相等”在纸上记下该蜡烛的位置A′1 d.改变玻璃板前蜡烛的位置重复以上实验在纸上记录物与像的位置A2A′2A3A′3如图乙所示. 2图乙中分别将实验中的物点与像点连接发现它们的连线始终与玻璃板面垂直且物到平面镜的距离与像到平面镜的距离选填“相等”或“不相等”.
LearntoCiteSources引用资料 Duringyouruniversityeducationyou'llbeexposedtoideasandscientifictheoriesofscholarsandscientists.Unavoidablyyourownideaswillbeshapedbytheideasyoucomeacross.1Thatmeansyoushouldgobeyondwhatyoulearninyourtextbooksorinthelibrary.Youroriginalworkisthebasisforyourprofessor'sevaluationofyourperformance.Thusacademichonestyisfundamentalinyouruniversityeducation.Itdemandsthatyoucitethesourcematerialsyoubaseyourownworkon.2. Correctlycitingyoursourceshelpsyoudistinguishyourownideasfromthoseofotherscholars.Onthereaders'sideitpermitsareadertodeterminethedepthofyourresearch.3Onthecontrarylackofcitingwillonlyraiseyourreader'sdoubt. Soyouneedtolearnwhentociteandhowtoprovideanadequateoraccuratereferencelist.Ifyoufailtociteyoursourceswhetherdeliberatelyorcarelesslyyouwillbefoundresponsibleforplagiarism抄袭.4Ifyouarenotsureaskyourprofessorforguidancebeforesubmittingthepaperorreport.Keepinmindthisgeneralrulewhenindoubtcite! 5ForexamplestudentsfromEastAsiamaythinkthatcopyingdirectlyfromsourcesistheproperwaytodoresearch.StudentsinFrancepreparingforthefinalexaminationmaybeencouragedtomemorizewholepassagesandcopythemintopapers.Thoseculturaldifferencescanleadtofalseassumptionsaboutacademicexpectationsinthecountryyoustudyin. A.Someuniversitystudentsmaycheatindifferentways. B.Theseincludeotherscholars'ideasfiguresgraphsandsoon. C.Theacademicchallengeyoufaceistomakesomethingoriginal. D.Oftenstudentswanttouseothers'opinionstosupporttheirownessays. E.Italsoallowsareadertoappreciateyouroriginalcontributiontotheresearch. F.Forinternationalstudentsitisimportanttoknowlocalacademicexpectations. G.Notknowingacademicregulationsisanunacceptableexcuseforsuchbehavior.
如图所示将碘锤放入热水中观察到碘锤中固态碘逐渐消失紫色的碘蒸气充满碘锤固态碘发生的物态变化是.在此实验中固态碘没有先变成液体再变成气体原因是已知碘的熔点是113.5℃碘的沸点是184.4℃
小明用如图所示的装置探究杠杆的机械效率他将两个钩码悬挂在B点在A点用弹簧测力计保持竖直方向拉动杠杆使其绕O点缓慢转动带动钩码上升一定的高度h不计摩擦
如图所示将正在发声的音叉放入水中能观察到音叉周围溅起许多水花.关于这个实验下列说法中正确的是
小敏在实验室测量某种液体的密度.小敏先将这种液体倒入量筒如图甲所示接着她用天平测出空烧杯的质量为40g然后她将量筒中的液体全部倒入烧杯用天平测量烧杯和液体的总质量天平平衡时的情景如图乙所示则烧杯和液体的总质量为g.请你根据以上实验数据计算出液体的密度为kg/m3这样测出的密度值比真实值选填“偏大”“偏小”或“无差别”
一只小鸟在平静的湖面上飞过当小鸟离水面4m时它的“倒影”距小鸟m“倒影”是由于光的形成的填“实”或“虚”像.
SmartKidsFestivalEvents SmartKidsisacollectionofonehundredeventsscheduledinOctober.ThisyearitisexperimentingwithPayWhatYouDecidePWYD.Thatisyoucandecidetopaywhatyouwanttoorcanaffordafteryouhaveattendedanevent.Youcanpre﹣bookeventswithoutpayingforaticketinadvance.Herearesomeofthedirector'spicks. WalkontheWildSide NotticketedFree JoinstorytellerSarahLawtohearsciencestoriesaboutanimals.Alongthewayyou'llmeetallsortsofbeautifulcreaturesanddiscoverlifecyclesandfoodchains.Bestsuitedtochildrenaged5﹣9.Childrenunder8mustbeaccompaniedbyanadult. IntroductiontoWaves Pre﹣bookPWYD Subjectsrangefromsoundwavestogravitywavesandfromwavesoflighttocrashingwavesontheocean.MikeGoldsmithexploresthefundamentalfeaturessharedbyallwavesinthenaturalworld. ScienceintheField NotticketedFree Thisstorytellingnightfeaturesascientistsharinghisfavouritememoriesofgatheringfirst﹣handdataonvariousfieldtrips.Comealongforinspiringandinformativestoriesstraightfromthescientist'smouth.JoinMarkSamuelstofindoutmoreinthisfun﹣filledworkshop. FestivalDinner Pre﹣book£25perperson WhetheryouwanttoexploremoreaboutfoodorjustfancyatalkoveramealjoinustomarkthefirstsciencefestivalinLondon.Whichfoodsshouldyoueattotrickyourbrainintothinkingthatyouarefull?FindoutmorefromTomCrawford. 1Inwhicheventcanyoudecidethepayment? A.WalkontheWildSide B.IntroductiontoWaves C.ScienceintheField D.FestivalDinner 2Whowilltalkaboutexperiencesofcollectingdirectdata? A.SarahLaw. B.MikeGoldsmith. C.MarkSamuels. D.TomCrawford. 3Whatdothefoureventshaveincommon? A.Family﹣based. B.Science﹣themed. C.Pickedbychildren. D.Filledwithadventures.
在如图所示的电路中闭合开关S后两个灯泡都能发光电流表A1和A2的指针均在图乙所示的位置则通过灯泡L1的电流是A通过灯泡L2的电流是A.
我国许多城市之中建有大型绿地绿地中的人工湖具有“吸热”功能盛夏时节能大大减弱周围地区的“热岛效应”.若某一人工湖湖水的质量为1.0×107kg水温升高2℃则湖水吸收的热量为J.若这些热量被同等质量的砂石吸收c砂石<c水则砂石升高的温度选填“大于”“小于”或“等于”2℃.c水=4.2×103J/kg•℃
春天人的皮肤干燥穿着化纤材料的衣服时皮肤与衣服不断摩擦使衣服带上电由于带电体具有的性质所以容易粘上灰尘.当用手拍打衣服时衣服由静止变为运动而灰尘由于具有仍然保持静止使衣服和灰尘分开而拍掉.
阅读下文然后回答文后问题. 万家丽路主线高架桥构建起长沙城市东部区域南北交通大动脉它北起福元路南至湘府路全长约16.6km采取“全线高架+主辅分离”形式主线按城市快速路标准建设为高架双向6车道设计车速为80km/h辅道按城市主干路标准建设为双向8车道含一对BRT快速公交专用道.为规范城市道路车辆通行秩序保障万家丽高架快速路交通有序安全和畅通避免超重超高车辆等对高架快速路设施的损害桥面快速道路的交通实行“五限”限行限车限载限速限高.万家丽快速路高架全线共设置了33台高清网络视频全方位摄像机按间距500m左右设置摄像机上下交错布置并加强对立交区域出入口等重点区域的监视实现全线视频监控以及无盲区覆盖监控通过最直观地视觉观察及时发现和处理各种交通事件. 1请用物理知识回答为什么小轿车在万家丽主线高架桥行驶时驾驶员和身边的乘客都必须系好安全带 . 2在不超速的情况下小轿车通过万家丽主线高架桥全程至少需要分钟. 3一辆小轿车在监控画面中越来越小则这辆小轿车离此摄像头的距离在变选填“远”或“近”.
热门题库
更多
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
高一下学期数学
教案备课库
高一上学期数学
高一上学期化学
教案备课库
教案备课库
教案备课库
高一上学期物理
教案备课库