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已知:如图,Rt△ABC中,∠C=90°,按要求填空:(1)∵sinA=,∴a=c·sinA,c= ;(2)∵cosA=,∴b= ,c= ;(3)∵tanA=∴a= ,b= ;(...
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如图已知Rt△ABC中∠ABC=90°AC=6BC=4将△ABC绕直角顶点C.顺时针旋转90°得到△
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如图所示已知在中∠ACB=900∠ABC=300AC=1而在Rt△ABD中∠DAB=900∠ABD=
如图已知Rt△ABC中∠ACB=90°D.是AB的中点CD=2cm则AB=.
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如图根据图中数据完成填空再按要求答题sin2A1+sin2B1=;sin2A2+sin2B2=;si
如图在Rt△ABC中∠BAC=90°.将Rt△ABC绕点C.按逆时针方向旋转48°得到Rt△点
在边
上,则∠
的大小为 (A.)42°. (
)48°. (
)52°. (
)58°. (第6题)
如图在Rt△ABC与Rt△DCB中已知∠A.=∠D.=90°请你添加一个条件不添加字母和辅助线使Rt
已知Rt△ABC中∠C.=90°a+b=14cmc=10cm则Rt△ABC的面积等于.
如图在方格纸上建立的平面直角坐标系中将Rt△ABC绕点C.按逆时针方向旋转90°得到Rt△FEC则点
的对应点F.的坐标是( ) A.(-1,0)
(-1,1)
(1,2)
(2,1)
如图已知Rt△ABC中∠ACB=90°D.是AB的中点AB=5则CD=.
如图9-34已知Rt△ABC中∠ABC=90°BD⊥AC于D.点.则________________
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已知如图所示在Rt△ABC中∠C.=90º1作∠B.的平分线BD交AC于点D.要求尺规作图保留作图痕
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HowtoFeelBeautifultotheInside Publicopinionmayhavesomesayinwhoisconsideredbeautifulontheoutsidebutinnerbeautytakesonawholeothermeaning1.Learnwhatbeautymeanstoyouandhavetheconfidencetolivebyyourownrulesstartingtoday. Askyourselfwhatbeautymeanstoyou.Howdoyoudefine定义innerbeauty?Isitapersonwhoisalwayssmiling?Someonewhohaskindwordsforeveryonehemeets?Orisyourdefinitionofbeautymorecomplex?2.Takeapenandanotebookandwritedownsomewordsthathelpyoudescribeinnerbeauty. Haveconfidenceinwhoyouare.Inadditiontostressingyourcharacterstrengthsyoucanapplyotherwaystofeelmoreconfident3.Thiscanbeanythingfrommakingmusictoplayingsports.Doingthingsyouaregoodatbuildsself﹣respect. Smileandlaughmore.4justarrangingyourfaceintoasmilingexpressioncanthoroughlychangeyourmood.Smilescanleadtoamorepositivemoodandamorehopefulattitude.Itcannotonlymakeyoufeelbeautifulinsidebutalsoimproveyourouterbeauty.5.Areliablemethodofdevelopingyourowninnerbeautyisadoptingthehabitofseeingthebeautyineverything.Allaroundyouthereareamazingpeopleplacesandthings.Makeanefforttoslowdownandacknowledgethesedaily. A.Noticethebeautyaroundyou. B.Whenyouwanttogetfeelingsofconfidence. C.Evenifyoudon'tquitefeeluptoitatthemoment. D.Besidesyoushouldtrytolaughasmuchaspossible. E.Takeamomenttoreflectonwhatbeautymeanstoyou. F.Ithasmoretodowithyourcharacterthanyourappearance. G.Frequentlytakepartyinactivitiesinwhichyouperformwell. 1. 2. 3. 4. 5.
如图AB是⊙O的直径点C在⊙O上过点C的切线交AB的延长线于点D∠ACD=120° 1求证AC=CD 2若⊙O的半径为2求图中阴影部分的面积.
画出图中杠杆上的力F1F2的力臂L1L2
IntheeighteenthcenturyoneofthefirstmoderneconomistsAdamSmiththoughtthatthewholeannualproduceofthelandandlabourofeverycountryprovidedrevenuetothreedifferentordersofpeoplethosewholivebyrentthosewholivebywagesandthosewholivebyprofit.Eachsuccessivestageoftheindustrialrevolutionhowevermadethesocialstructuremorecomplicated. Manyintermediategroupsgrewupduringthenineteenthcenturybetweentheuppermiddleclassandtheworkingclass.Thereweresmall﹣scaleindustrialistsaswellaslargeonessmallshopkeepersandtradesmenofficialsandsalariedemployeesskilledandunskilledworkersandprofessionalmensuchasdoctorsandteachers.Farmersandpeasantscontinuedinallcountriesasindependentgroups. Duringthenineteenthandearlytwentiethcenturiesthepossessionofwealthinevitablyaffectedaperson'ssocialposition.Intelligentindustrialistswithinitiativemadefortunesbytheirwitswhichliftedthemintoaneconomicgroupfarhigherthanthatoftheirworking﹣classparents.Buttheylackedsocialtrainingoftheupperclasswhodespisedthemasthenewrich. Theyoftensenttheirsonsanddaughterstospecialschoolstoacquiresocialtraining.Heretheirchildrenmixedwiththechildrenoftheupperclasseswereacceptedbythemandveryoftenfoundmarriagepartnersfromamongthem.Inthesamewayathriftyhardworkinglabourerthoughnotcleverhimselfmightsaveforhissonenoughtopayforanextendedsecondaryschooleducationinthehopethathewouldmoveinawhite﹣collaroccupationcarryingwithitahighersalaryandamoveupinthesocialscale. Inthetwentiethcenturytheincreasedtaxationofhigherincomesthegrowthofthesocialservicesandthewiderdevelopmentofeducationalopportunityhaveconsiderablyalteredthesocialoutlook.Theupperclassesnolongerarethesoleoreventhemainpossessorsofwealthpowerandeducationthoughinheritedsocialpositionstillcarriesconsiderableprestige. 21.WhatcriteriondidAdamSmithseemtogobyinhisclassificationofsocialgroups? A.Theamountofwealth B.Theamountofmoney C.Thesocialstatus D.Thewayofgettingmoney 22.IfyoucomparethefirstandsecondparagraphwhatgroupsofpeopledidAdamSmithleaveoutinhisclassification? A.Officialsandemployees. B.Peasantsandfarmers. C.Doctorsandteachers. D.Tradesmenandlandlords. 23.Whowerethe'newrich'duringthenineteenthandearlytwentiethcenturies? A.Theywerestilltheupperclasspeople. B.Theywereownersoflargefactories. C.Theywereintelligentindustrialists. D.Theywereskilledworkerswhomadetheirfortune. 24.Accordingtothepassagewhatdidthosepeopledowhointendedtomaketheirchildrenmoveupinthesocialladder? A.Theysavedalotofmoneyfortheirchildrentoreceivehighereducation. B.Theytriedtofindmarriagepartnersfromthechildrenoftheupperclass. C.Theymadegreaterfortunesbytheirwits. D.Theyworkedevenhardertoacquiresocialtraining. 25.Inthetwentiethcenturyclassdifferenceshavebeenpartlysmoothedoutby. A.increasedincomeanddecreasedtaxation B.taxationsocialservicesandeducationalopportunities C.educationtheincreaseofincomeandindustrialdevelopment D.thedecreaseoftheupperclasspopulation.
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