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，AB为⊙O的直径，C为⊙O上一点，AC平分∠DAB，AD⊥CD于D． （1）求证：DE是⊙O的切线； （2）若DC＝3，tan∠DAC＝，求⊙O的面积（结果保留π）．
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AB是⊙O.的直径点C.是⊙O.上一点过点C.作⊙O.的切线PC交AB的延长线于点P.过点A.作
如图点C.在以AB为直径的⊙O.上AD与过点C.的切线垂直垂足为点D.AD交⊙O.于点E.1求证AC
如图AB为⊙O.的直径点C.为半圆上一点AD平分∠CAB交⊙O.于点D.连接OD.1求证OD//AC
如图AB为⊙O的直径C为⊙O上一点AD和过C点的切线互相垂直垂足为DAD交⊙O于点E.1求证AC平分
如图AB是⊙O.的直径C.是半圆O.上的一点AC平分∠DABAD⊥CD垂足为D.AD交⊙O.于点E.
如图AB为⊙O.的直径C.为⊙O.上一点AD和过C.点的切线互相垂直垂足为D.AD交⊙O.于点E.1
已知如图AB是⊙O.的直径C.为⊙O.上一点AD垂直于经过点C.的直线DE垂足为点D.AC平分∠DA
如图AB为⊙O.的直径点C.在⊙O.上AD⊥CD于点D.且AC平分∠DAB求证1直线DC是⊙O.的切
如图AB为⊙O的直径C为⊙O上一点AD和过C点的直线互相垂直垂足为D且AC平分∠DAB.1求证DC为
如图AB为⊙O.的直径C.为⊙O.上一点AD和过C.点的直线互相垂直垂足为D.且AC平分∠DAB.1
如图AB为⊙O的直径C.为⊙O上一点AD和过C.点的直线互相垂直垂足为D.且AC平分∠DAB.1求证
如图AB为⊙O的直径C为⊙O上一点弦AD平分∠BAC交BC于点EAB=10AD=8则AE的长为.
如图AB是⊙O.的直径C.是⊙O.上一点AC平分∠BADAD⊥CD垂足为D.1求证CD是⊙O.的切线
如图AB为⊙O的直径C.为⊙O上一点AD和过C.点的切线互相垂直垂足为D.AD交⊙O于点E.1求证A
如图AB为⊙O.的直径C.为⊙O.上一点AD和过C.点的切线互相垂直垂足为D.AD交⊙O.于点E.1
已知如图AB是⊙O.的直径C.为⊙O.上一点AD垂直于经过点C.的直线DE垂足为点D.AC平分∠DA
如图AB为⊙O.的直径C.为⊙O.上一点AD和过点C.的切线互相垂直垂足为D.求证AC平分∠DAB.
如图AB为⊙O.的直径C.为⊙O.上一点AD和过C.点的切线互相垂直垂足为D.锐角∠DAB的平分线A
如图⊙O.的直径AB长为12C.为⊙O.上一点AD和过点C.的切线互相垂直垂足为D.1求证AC平分∠
如图AB为⊙O.的直径C.为⊙O.上一点AD和过C.点的直线互相垂直垂足为D.且AC平分∠DAB.1
热门试题
更多
Everyoneknowsthatit'shardtodrinkinspacebecauseofthelowgravitybutChineseastronautsJingHaipengandChenDongshowedushowtheydrankteaonaTVshowduringthemonth﹣longtripinShenzhouXIspaceshiplastyear.TheyusedaspeciallymadeteacupandaspecialPu'ercreamtodrinkteawhilestandingupsidedown. ThePu'erteacreamtheydrankisproducedinYunnanprovincewhichisknownforitsPu'erteaindustry. DrinkinghotteaishardersaidJingHaipeng.Thedifficultpartofdrinkingteainspaceisthatthereshouldnotbanythingleftaftertheteadissolves溶解inwateralsothesolubility溶解度oftheteashouldbelowsincewaterinspacecanonlybewarmedto60degreesatmost. TheteacreamtheastronautsdrankisproducedbyGongrunxiangTeaIndustryCorpinKunming.ZhangGuanghuimanagerofGongrunxiangsaidthatthecompanytriestoproduceateacreamthat'sasafehealthyteaproduct.Teaproductsareoftenreportedtobepollutedbyairandheavymetals.InverimaginedthatonedayourteacreamwouldhelpastronautstodrinkteainspaceZhangsaidaddingthatdrinkingteainspacecanbeseenasaturningpointforthePu'erteaindustry. Forusastronauts'drinkingteainspacemeansourtechnologyusedintheteaindustryhashadsomeachievementsZhangsaid.Inthefuturemoreteaproducerswilluseittoimprovetheteaindustry. 31.Whatcanwelearnfromthepassage A.Astronautsareabletoenjoymanykindsofteainspace. B.Theteacreamisreportedtobepollutedbyairandheavymetals. C.Theatronautsshowedhowtheydrankteaafterreturningtotheearth. D.Thetechnologyusedintheteaindustrymayhelptheastronautsdrinktea. 32.WhichisNOTthereasonwhyit'sdifficultfortheastronautstodrinkhotteainspace A.Drinkingisveryhardinthelow﹣gravitysituation. B.Thesolubilityoftheteashouldremainthesame. C.Theyhavetouseakinofspeciallymadeteacup. D.Thereshouldbenothingleftaftertheteadissolvesinwater. 33.WhydoesZhangconsiderdrinkingteainspaceisaturningpointforthePu'erteaindustry A.Hethinksitmighthelpastronautsinspace. B.HethinksitmightmakePu'erteadissolveeasily. C.HethinksitmighthelpimprovetheproductionofPu'ertea. D.HethinksitmighthelpimprovetheteaindustryandmakePu'erteapopular.
﹣Asweknowit'sdifficulttoliveintheforeigncountry. ﹣ifyoudon'tunderstandthelocallanguage. A.Generally B.Naturally C.Exactly D.Especially
﹣Thestuntmanisplanningtowalkonthewingsofaflyingplane. ﹣What?!I'veneverheardofideabefore. A.acrazier B.thecrazier C.acraziest D.thecraziest
Asweknowtoolsmadeofmetalnotbreakeasily.
Severalyearsofhardworkledtheengineertoachievesuccess.
﹣﹣﹣Whatdoyouthinkofthevegetablesoup? ﹣﹣﹣Wellitalittlesalty. A.looks B.smells C.sounds D.tastes
ThenumberofprivatecarsincreaseinChinainrecentyears.
MyunclearrivedwhenIleave.Ihadtoreceivehimfirst.
WearesurethatPM2.5controlifweworktogethertodealwithpollutionproblems.
﹣Whydidn'tyouaskusforhelpwhenyouwereintrouble ﹣I.Imanagedperfectlywellonmyown. A.mustn't B.needn'tto C.didn'thaveto D.couldn't
你知道那对夫妇为什么缺席昨天的晚会 Doyouknowtheeveningpartyyesterday
﹣Whichoftheseshirtsdoyoulikebest? ﹣I'lltake.Theyareallexpensiveandoutoffashion. A.neither B.either C.none D.both
AMESAustralia﹣FlagstaffisgladtoofferyouaplaceinCertificate证书inSpokenandWrittenEnglish.ThiscourseispartoftheAdultMigrantEnglishProgramfoundedbytheAustraliaGovernmentDepartmentofEducation&Training. Coursedatesare03.10.2017﹣14.12.2017 ●Timetable ●Thisis12hoursperweek. ●Ifyoucan'tattendonthefirstdayyoumusttellus.Pleasecontacttheofficeon99264717. ●Ifyouneithercontactusnorattendonthefirstdayyoumayloseyourplaceintheclass. ●Ifyourchildrenneedcarepleasecontactus. ●Ifyouneedtogiveupthecourseyoumusttellbothyourcounselorandyourteacher. 25.HowlongwilltheSpokenandWrittenEnglishcourselast A.Aboutthreedays. B.Over2months. C.About11months. D.Lessthan2months. 26.What'stheChinesemeaningofcounselorinthepassage A.顾问 B.班主任 C.辅导员 D.考官 27.WhichofthefollowingisTRUEaccordingtothecourse A.Room5isonlyforLevel4students. B.Peopleofallagescantakethiscourse. C.YoucanhavelessonsinRoom2onMonday. D.You'resuretoloseyourplaceunlessyouattendonthefirstday.
Thedeskis专门designedfordisabledpeople.
MsZhaoteachesEnglishsowell.Sheis严格的withallherstudents.
Themangreatwealthishardto. A.withgetonwithhim B.ofgetalongwith C.withgetalong D.ofgetonwithhim
在国内接受高水平的教育是可能的. Itispossibleathome.
MoredotoreducetheairpollutioninChinafromnowon.
Tomwasthathecouldn'tunderstanddifficultsentence. A.sostupidaboyasuch B.sostupidaboysucha C.soastupidboysuch D.asostupidboyasuch
我哥哥曾经考虑回无锡以便将来找到好工作. Mybrotherhecangetagoodjobinthefuture.
Ahobbyisanactivitywecandoinourfreetimesothatwecankeepourselvesbusywithsomethingthatmakesushappy.Differentpeoplehavedifferentkindsofhobbiesaccordingtotheirpersonallikesanddislikes.Hobbiesareactivitieswechoosetodobutnotactivitieswehavetodo.Thereisalotofdifferencebetweenwantingtodosomethingandhavingtodoit.Weonlywanttodothosethingsweliketodoandthingsthatgiveuspleasureandpeaceofmind. Hobbiesplayaveryimportantroleinourlives.Forexampletheyareawayofconnectinguswithourinnerself.Thetimedevotedtotakingupahobbyisourowntime.Thisisthetimewhenwecanconnectandcommunicatewithourselves.Duringthispersonaltimewecandowhateverwelike.Doingthingsaccordingtoourownwishesgivesusasenseofinnersatisfactionandalsohelpsdevelopself﹣confidence. Hobbiesalsohelpdiscovertalents.Thereisapossibilitythatweareinterestedinacertainactivitybuthaveneverhadachancetotryit.Ifwedevelopourinterestasourhobbiesit'squiteclearthatwe'lldoitwithgreatinterest.Soevenifwehavenevertriedacertainthingbeforewecanstilllearntodoit.Thehobbyists'hiddentalentscanbediscoveredandthiscanmakethemfeelmoreconfident. It'shumannaturetotrytoknowmoreaboutthethingswelike.Themomentwepursue追求someactivitiesasourfavoritehobbieswewanttogainmoreknowledgeaboutthesamehobby.Whetherit'sgardeningcookingpaintingorcollectingstampswealwaystrytogetadeeperunderstandingofwhatwe'redoingsothatwecandoitmorecorrectly.What'smorewealsohappentomeetpeoplewithsimilartastesandsometimesowningrichknowledgeabouttheirhobbies.Besidesgainingknowledgehobbiesalsoprovideuswithachancetomeetpeoplewhosharesimilarlikesanddislikeswithus. Whateverourhobbiesaretheycanbedevelopedatanyageasachildorasanadult.Howeverifwebeginatayoungagewecangetmoretimetoexperiencethejoys.Thehobbymaygrowwithusandsomedaymayalsotakeustogreatheights. Whydowetakeuphobbies? Paragraphoutline Supportingdetails Meanings Hobbiesareactivitieswedoinoursparetimeandcanmakeushappy. Hobbiesareactivitieswedoaccordingtothe54wemake. Advantages Helpingconnect withtheinnerself Thetime55onthehobbyisourpersonaltimewhenwecanbefreetodoanythingwelike. We'llfeel56andbecomemoreconfident. Helpingdiscover talents Wecanlearnalotbytryingsomeactivitieswithgreatinterest. We'llbeabletofindourhiddentalents. Helpinggain knowledge Whenpursuingahobbyweshouldtryourbestto57itwellandthenwegainalotofknowledge. Wecanalsomeetsomelearnedpeopleandlearnalot fromthem. Conclusion 58allhobbiescanbedevelopedatanyageyetit'sbettertodeveloponewhenweareyoung. 54. 55. 56. 57. 58.
Mygrandmaisforgetfulandoftenrepeatherselfwhenshetellsastory.
﹣HongqiaoAirportsirplease!I'llbethereby10. ﹣butI'lltrymybest. A.Ican'tpromise B.Noproblem C.Allright D.It'simpossible
Ifyoucan'tgetalongwellwithyourneighborsyou'llmakeyourlifeterribledayafterday.Butifyoutakethetimetodevelopagoodrelationshipwithyourneighborsitcanbringyoumanyadvantagesincludingafriendliercommunityasaferneighborhoodandanicerandmorecomfortablearea.Therearesomesuggestionsforyoutobeagoodneighbor. Ifyou'renewintheneighborhoodintroduceyourself.Sayhelloofferawelcominggiftandshareoraskaboutthelocalarea. Beawareofthesharedwalls.Ifyouandyourneighborssharelivingspacesandliveclosetoeachothertrytoputthenoisywashingmachinesanddryersawayfromthesharedwalls. Keepyourpetdogonaleash皮带ifithasahabitofrunningwildlyonyourneighbor'slawnsespeciallyiftheyhaveapetoftheirownandmakesuretocleanupafterit. Whenyouparkyourcarbesurenottoblockanyone'sdoorwayorleavethemaverysmallparkingspace.Don'tslam砰地关上yourcardoorslateatnight. Cutthegrassinyourgardenasoftenasyoucanbecausethegrassinyouryardisnotonlyuglybutalsocanspreadtoyourneighbor'syard. Reallygoodneighborslookaftereachother.Theyoffertohelpespeciallyonmattersthathaveinfluenceonthelargerneighborhoodandlookforhancestocommunicate.Greatneighborsleadtogreatneighborhoods. TopicTobeagoodneighbor 54ofdevelopingagoodrelationshipwithneighbors ★55tohaveagoodrelationshipwithyourneighborswillmakeyoufeelterribledayafterday. ★Agoodrelationshipwithneighborscanbringmanyadvantageswhichmay includeafriendliercommunityasaferneighborhoodandanicerandmorecomfortablearea. Tipsfor56agoodrelationship withneighbors ★Introduceyourselfwhenyouareinanewplace. ★Beawareofthesharedwallsifyouandyourneighborliveclosetoeach other. ★Remembertocleanupafteryourdogrunsonyourneighbors'lawns. ★57slammingyourcardoorswhenyouparkyourcarlateatnight. ★Cutthegrassinyourgardenasoftenaspossible. Conclusions ★Goodneighborsaffectmorepeopleoffertohelpandexpecttocommunicate. ★Therearenogreatneighborhoods58greatneighbors. 54. 55. 56. 57. 58.
RedlanternsareoftenhangalongthestreetbeforethelanternFestival.
Mike'steacherkepttellinghimthatheshouldworkharderbutdidn'thelp. A.he B.which C.what D.it
Nowscientistsaremakingfarstudytobetterunderstandouruniverse宇宙.
﹣Couldyoutellme ﹣Romewasnotbuiltinaday.Youshouldtrytogiveitenoughchancestobecomestrong. A.whatIcandotohaveagoodmemory B.howIcandotohaveagoodmemory C.whyIshouldhaveagoodmemory D.howcanIhaveagoodmemory
It'sreportedthatthecasethepolicedevotedthemselvestosolvefinally.
Ifyouarenotcompletesatisfiedyoucangetyourmoneyback.
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
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
湘公网安备 43130202000226号