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⊙O为△ABC的外接圆，请仅用无刻度的直尺，根据下列条件分别在图1，图2中画出一条弦，使这条弦将△ABC分成面积相等的两部分（保留作图痕迹，不写作法）． （1）如图1，AC＝BC； （2）如图2...
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如图⊙O.是△ABC的外接圆AB＝ACP.是⊙O.上一点.1请你只用无刻度的直尺分别画出图①和图②中
⊙O为△ABC的外接圆请仅用无刻度的直尺根据下列条件分别在图1图2中画出一条弦使这条弦将△ABC分
如图⊙O.是△ABC的外接圆直径AD=4∠ABC=∠DAC则AC长为
已知△ABC的边BC=4cm⊙O.是其外接圆且半径也为4cm则∠A.的度数是____
如图⊙O.是△ABC的外接圆半径为4直线l与⊙O.相切切点为P.l∥BCl与BC间的距离为7.1仅用
⊙O为△ABC的外接圆请仅用无刻度的直尺根据下列条件分别在图1图2中画出一条弦使这条弦将△ABC分
如图△ABC与△DEF关于直线l对称请仅用无刻度的直尺在下面两个图中分别作出直线l.
⊙O.为△ABC的外接圆请仅用无刻度的直尺根据下列条件分别在图1图2中画出一条弦使这条弦将△ABC分
在△ABC中∠C.=90°AC=4BC=3.1用直尺和圆规在图1中作出△ABC的外接圆在图2中作出△
已知⊙O.是△ABC的外接圆∠OAB=40°则∠ACB的大小为
20°
50°
20°或160°
50°或130°
⊙O.为△ABC的外接圆请仅用无刻度的直尺根据下列条件分别在图1图2中画出一条弦使这条弦将△ABC分
⊙O.为△ABC的外接圆请仅用无刻度的直尺根据下列条件分别在图1图2中画出一条弦使这条弦将△ABC分
.如图⊙O为△ABC的外接圆直线l与⊙O相切与点P且l∥BC.1请仅用无刻度的直尺在⊙O中画出一条弦
如图已知线段AB.[来⑴仅用没有刻度的直尺和圆规作一个以AB为腰底角等于30°的等腰△ABC.保留作
如图⊙O.是△ABC的外接圆AB＝ACP.是⊙O.上一点.1请你只用无刻度的直尺分别画出图①和图②中
如图⊙O为△ABC的外接圆直线l与⊙O相切与点P且l∥BC． 1请仅用无刻度的直尺在⊙O中画出一
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6.00分如图已知点E在直角三角形ABC的斜边AB上以AE为直径的⊙O与直角边BC相切于点D．1请仅
如图⊙O是△ABC的外接圆AB=ACP是⊙O上一点.1请你只用无刻度的直尺分别画出图①和图②中∠P的
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＝68°，则∠OBC的大小是 A.22°
26°
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Tenyearsagomanypeoplethoughtthattheageofthephysicalbooks纸质书wascomingtoanend.Theobjectsthathadbeenthecompanions伙伴ofmillionsof16forhundredsofyearsweregoingtodieout.Soonwe'dallbereadingonlittleelectronicscreensandlaughingatthememoryofplacescalled17andbookshops. Butitseemsnottrueabouttheideaofthedeathofthephysicalbooks.AtleastintheUKasTheGuardiannotedsalesofe﹣booksarefallingwhilesalesofphysicalbooksare18.Moresurprisinglyit'syoungpeoplewhoarebuyingthemostphysicalbooks.Morethan60percentof16﹣to﹣24﹣year﹣olds19printbookstoe﹣books.Therearemanyreasonsandthemostpopularoneis:Iwouldliketo20theproduct. Booksbecomeverypersonalobjectstoreadinglovers.Itoftenstarts21theygetthebooks.Manybuyersofbooksliketowritedowntheirnamesontheinsidecoverwhenthey'veboughtone.Andwe22booksaroundwithuseverywhere. Ifthere'samarkmadeonthepagesfromcoffeeorfooditdoesn'tmatter.Thesesmall23 makeourbooksevenmorepersonal.It'sjustlikereadersofphysicalbooksmakefriendswiththem. Thefriendship24peopledevelopwithbooksisn'tjustaboutfeelings.Researchhasshownthatreadersremembermoreinformationfromreadingphysicalbooksthanelectronicones. Howeverthere'sno25thate﹣booksareheretostay.Theyaren'tsimplyaheretodaygonetomorrowthing.Butit'salsocertainthatphysicalbookswhichhavebeeninproductionsincethefifteenthcenturyareheretostaytoo. 16.A.workers B.farmers C.doctors D.readers 17.A.theatres B.labs C.libraries D.studios 18.A.rising B.raising C.rushing D.resting 19.A.pick B.prefer C.like D.want 20.A.put B.lay C.hold D.throw 21.A.while B.since C.before D.when 22.A.read B.carry C.show D.donate 23.A.accidents B.stories C.presents D.messages 24.A.who B.what C.that D.when 25.A.way B.need C.excuse D.doubt
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