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若不等式组，表示的平面区域为直角三角形，则该三角形的外接圆面积为（ ）
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高一下学期数学《》真题及答案
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如图分别作出锐角三角形ABC.直角三角形ABC.钝角三角形ABC的外接圆观察所画外接圆探究三角形的外
直角三角形的两边长分别为16和12则此三角形的外接圆半径是.
在△ABC中若则这个三角形是
底角不等于45°的等腰三角形
锐角不等于45°的直角三角形
等腰直角三角形
等腰三角形或直角三角形
若直角三角形ABC的两条直角边ACBC的长分别是5cm和12cm则此直角三角形外接圆半径为_____
直角三角形的两边长分别为16和12则此三角形的外接圆半径是________.
以半径为1的圆内接正三角形正方形正六边形的边心距为三边作三角形则
不能构成三角形
这个三角形是等腰三角形
这个三角形是直角三角形
这个三角形是等腰直角三角形
一个直角三角形的两条边长是方程的两个根则该直角三角形的外接圆的面积为.
已知直角三角形的两条直角边长分别为6cm和8cm则这个直角三角形的外接圆的半径为cm.
若△ABC的外接圆的圆心在△ABC的外部则△ABC是
锐角三角形
直角三角形
钝角三角形
无法确定
直角三角形的两边长分别为16和12则此三角形的外接圆半径是________.F.
直角三角形的两边长分别为16和12则此三角形的外接圆半径是
在△ABC中若b－bcosB.sin
＝a (sin
－sin
cosC.)，则这个三角形是 A.等腰直角三角形B.底角不等于45°的等腰三角形 C.等腰三角形或直角三角形
锐角不等于45°的直角三角形
一个直角三角形的两条直角边长是方程的两个根则此直角三角形外接圆的半径等于
三角形按角分类可以分为
锐角三角形、直角三角形、钝角三角形
等腰三角形、等边三角形、不等边三角形
直角三角形、等腰直角三角形
以上答案都不正确
若不等式组表示面积为1的直角三角形区域则实数k的值为
1
－1
0
－2
如果不等式组表示的平面区域是一个直角三角形则该三角形的面积为．
已知△ABC外接圆O.的半径为1且从圆O.内随机取一个点M.若点M.取自△ABC内的概率恰为则△AB
直角三角形
等边三角形
钝角三角形
等腰直角三角形
已知点A.是直角三角形ABC的直角顶点且则三角形ABC的外接圆的方程是▲.
一个直角三角形的两条边长是方程的两个根则此直角三角形的外接圆的面积为.
直角三角形的外接圆半径为5cm内切圆半径为1cm则此三角形的周长是.
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YouprobablyknowwhoMarieCuriewasbutyoumaynothaveheardofRachelCarson.Oftheoutstandingladieslistedbelowwhodoyouthinkwasthemostimportantwomanofthepast100years? JaneAddams1860﹣1935 AnyonewhohaseverbeenhelpedbyasocialworkerhasJaneAddamstothank.Addanshelpedthepoorandworkedforpeace.Sheencouragedasenseofcommunity社区bycreatingsheltersandpromotingeducationandservicesforpeopleinneedIn1931AddamsbecamethefirstAmericanwomantowintheNobelPeacePrize. RachelCarson1907﹣1964 Ifitweren'tforRachelCarsontheenvironmentalmovementmightnotexisttoday.Herpopular1962bookSilentSpringraisedawarenessofthedangersofpollutionandtheharmfuleffectsofchemicalsonhumansandontheworld'slakesandoceans. SandraDayO'Connor1930﹣present WhenSandraDayO'ConnorfinishedthirdinherclassatStanfordLawSchoolin1952shecouldnotfindworkatalawfirmbecauseshewasawoman.ShebecameanArizonastatesenator参议员andin1981thefirstwomantojointheU.S.SupremeCourt.O'Connorgavethedecidingvoteinmanyimportantcasesduringher24yearsonthetopcourt. RosaParks1913﹣2005 OnDecember11955inMontgomeryAlabamaRasaParkswouldnotgiveupherseatonabustoapassenger.HersimpleactlandedParksinprison.ButitalsosetlfftheMontgmerybusboycott.Itlastedformorethanayearandkickedoffthecivil﹣rightsmovement.TheonlytiredIwaswastiredlrgivinginsaidParks. 1WhatisJaneAddamsnotedforinhistory? A.Hersocialwork B.Herlackofpropertraininginlaw C.Hereffortstowinaprize D.Hercommunitybackground 2WhatisthereasonforO'Connor'sbeingrejectedbythelawfirm? A.Herlackofpropertraininginlaw B.Herlittleworkexperienceincourt C.Thediscriminationagainstwomen D.Thepoorfinancialconditions 3Whomadeagreatcontributiontothecivil﹣rightsmovementintheUS? A.JaneAddams B.RachelCarson C.SandraDayO'Connor 4Whatcanweinferaboutthewomenmentionedinthetext? A.Theyarehighlyeducated B.Theyaretrulycreative C.Theyarepioneers D.Theyarepeace﹣lovers
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Hewantedhissontobecomestrongandalikehimwhoisfondofandgoodatdifferentsports.
Mostanimalsonlandareknowntousbutmanylivingthingsunderwaterarenot.Nowlet'sgettoknowsomeofthem. Seacucumber Seacucumberarestrangeanimalslivingatthebottomofthesea.Theywearbrownorpalegreencoatswithmanysticksup.Whensummercomestheystaydeeptosleepbecausetheyareafraidofheat.Andwhenitisautumntheymovetoshallow浅的waterandgettheirfood. Pike Thepikeisakindoffreshwaterfish.Theyaregoodswimmersandlikeswimmingnearboatswaitingtobefed.Theyhavesharpteethtocatchfishes.Whentheyareyoungtheyliveingroups.Howeverwhentheygrowuptheyprefertolivealone. Cuttlefish Acuttlefishcanswimquitefastsoitisalsocalledrocket火箭fish.Ithaseightarmsandtwofeelersonitsheadjustarounditsmouth.Itejectsink喷墨whenitisindanger.Itsmeatisdeliciousanditisoftenthefirstchoiceformanypeople. Octopus Anoctopushaslongarmswithwhichtocatchfoodandprotectitself.Whenitissleepingoneortwoofitsarmsarestillondutykeepingmoving.Onceitfeelssomethingdangerousitcanwakeupatoncetotakeaction. 1Seacucumbersstaydeeptosleepinsummerbecausethey. A.areafraidofhightemperature B.wanttogetstrongandfat C.areafraidoftheirenemy D.wanttolivealone 2Accordingtothepassagelikestoswimnearboats. A.theseacucumber B.thepike C.thecuttlefish D.theoctopus 3Whathappensifacuttlefishmeetsitsenemy? A.Itrushesattheenemyatonce. B.Itcutsoffoneofitsarms. C.Itbiteswithitssharpteeth. D.Itejectsinktotheenemy. 4Theofanoctopuscanhelpprotectitwhenindanger. A.color B.arms C.sound D.smells
WaltDisneywasbornonDecember51901.Disneybecameoneofthebest﹣knownmotionpictureproducersintheworld.Heisparticularlynotedforbeingafilmproducerandapopularshowmanaswellasaninnovatorinanimationandthemeparkdesign. Disneyisfamousforhiscontributionsinthefieldofentertainmentduringthe20thcentury.HisfirstsuccesswasthroughtheseriesOswaldtheLuckyRabbitwhichwascreatedbytheDisneystudioforCharlesMintzofUniversalStudios.WhenDisneyaskedforalargerbudgetforhispopularOswaldseriesMintzrefusedandDisneyhadtoquit.LaterDisneyandhisbrotherRoyO.Disneystartedfromscratchandco﹣foundedWaltDisneyProductionsnowknownasTheWaltDisneyCompany.TodaythiscompanyhasannualrevenuesofapproximatelyU.S.﹩35billion.Thissuccessislargelyduetoanumberoftheworld'smostfamousfictionalcharactersheandhisstaffcreatedincludingMickeyMouseacharacterforwhichDisneyhimselfwastheoriginalvoice. Disneywon26AcademyAwardsoutof59nominationsincludingarecordfourinoneyeargivinghimmoreawardsandnominationsthananyotherindividual.HeisalsothenamesakeforDisneylandandWaltDisneyWorldResortthemeparksintheUnitedStatesaswellastheinternationalresortsinJapanFranceandChina. DisneydiedoflungcancerinBurbankCaliforniaonDecember151966.ThefollowingyearconstructionbeganonWaltDisneyWorldResortinFlorida.HisbrotherRoyDisneyinauguratedTheMagicKingdomonOctober11971. 1WaltDisneycanbedescribedwiththefollowingwordsexcept. A.Famous. B.Creative. C.Versatile. D.Respectful. 2WhichofthefollowingstatementisTRUEaccordingtothetext? A.WaltDisney'stalentwasnotvaluedbyhisoldbossCharlesMints. B.MickeyMousemadeagreatcontributionforTheWaltDisneyCompany. C.OswaldtheLuckyRabbitisconsideredthegreatestsuccessbyWaltDisney. D.WaltDisneyandhisbrotherstartedanewcompanywiththehelpofasponsor. 3WhichofthefollowinginformationisNOTmentionedinthetext? A.TheroadtofameandsuccessforDisney. B.MisfortunesandregretsinDisney'slife. C.Disney'stalentsinthefieldofentertainment. D.AchievementsandrecognitionthatDisneygained.
Itwasthegirlssawtheoldmaninthemorninghewastakingawalk. A.whothat B.whowhen C.thatwho D.thatthat
Theyoungmanwillhavethegoodsdtomorrowsoyou'llreceivethemsoon.
Whenpeopleusewordsand短语differentfromthestandardlanguageitiscalledadialect.
BecausemostJapanesepeopledon'treallyliketheideaofhavingaroommatealotoftheseyoungpeopleenduplivingaloneincludingyoungwomen.WhileTokyoismuchsaferthanlargecitiesinmanyothercountriescrimesdohappenandcriminalsoftenconsideryoungwomenwholivealonetobeeasytargets. Tohelpaddressthisproblemandalsotoputthemindsoffemaletenants房客ateaseapartmentmanagementcompanyLeoPalace21hasdevelopedwhatitcallstheManontheCurtainsystem. Usingaprojector投影仪controlledbyasmartphoneManontheCurtainthrowsanoutlineofamanontoyourcurtainssothatwhenpeopleoutsidelookatyourwindowstherewillappeartobeaguyinsidethusmaskingthatyoulivealone.Ifyou'rewonderinghowthat'sbetterthanjustputtingacardboardcutout剪贴画byyourwindowManontheCurtainisfull﹣motionprojectingvideosofactualactorsforanextremelylifelikelook. Currentlythesystemhas12differentoptionsincludingsuchfrighteningroutinesasabodybuilderworkingoutwithdumbbellsandasportsfanswingingabaseballbataroundwhichseemslikeitcoulddoubleasafitnessvideothatyoucoulddoyourselftogetherwithyourshadowyprotector. Sinceit'dbeeasytoinferthatashortsetpatternisafakeeachvideoisroughly30minuteslongwithavarietyofmotions. Grantedsomeoftheoptionssuchasthemanvacuumingorplayingguitararen'tgoingtobeaseffectiveifawould﹣becriminaliscloseenoughtothewindowtonoticethelackofsound.Buttheimagesthemselvesareveryconvincing. 1Whichofthefollowingstatementsisright? A.Tokyoisacityofnocrime. B.LadiesareeasilyrobbedinJapan. C.Onlyyoungladiesenjoybeingalone. D.LeoPalace21worksonapartmentaffairs. 2WhatistrueabouttheManontheCurtainSystem? A.It'sapopularmobileAPP. B.Itcanfindcriminalbehaviors. C.Itplaysavividcartoonfortenants. D.It'smainlydesignedforfemalelivingalone. 3WhatdoweknowaboutParagraph3? A.Cutoutsarebetterthanthesystem. B.Cutoutsaren'teffectiveatall. C.Peoplemaythinkyouarenotalone. D.Youcanwatchvideoswhenalone. 4Whatcanweinferaboutthesystemfromthelastparagraph? A.Itmaybeimprovedbythecompany. B.Itsvideowilllastlonger. C.Itsmotionsaren'tvividenough. D.Itwon'tbewellreceived.
Whenfromthehillthebuildinglooksmorebeautiful. A.seeing B.seen C.saw D.tosee
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