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如图，F为⊙O上的一点，过点F作⊙O的切线与直径AC的延长线交于点D，过圆上的另一点B作AO的垂线，交DF的延长线于点M，交⊙O于点E，垂足为H，连接AF，交BM于点G． （1）求证：△MFG为等...
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如图AB是半圆O.的直径C.为半圆上一点N.是线段BC上一点不与B.﹑C.重合过N.作AB的垂线交A
如图已知AB为半圆O的直径C为半圆O上一点连接ACBC过点O作OD⊥AC于点D过点A作半圆O的切线交
如图已知AB为⊙O.的直径F.为⊙O.上一点AC平分∠BAF且交⊙O.于点C.过点C.作CD⊥AF于
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
如图已知AB为⊙O.的直径E.是AB延长线上一点点C.是⊙O.上的一点连结ECBCAC且∠BCE＝∠
如图过⊙O上一点C作⊙O的切线交⊙O直径AB的延长线于点D.若∠D.=40°则∠A的度数为
20°
25°
30°
40°
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
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AB是⊙O的直径∠BAC=30°M是OA上一点过M作AB的垂线交AC于点N交BC的延长线于点E直
如图△ABC中AB=AC点D.为BC上一点且AD=DC过A.B.D.三点作⊙O.AE是⊙O.的直径连
如图AB是半圆O.的直径C.为半圆上一点N.是线段BC上一点不与B.﹑C.重合过N.作AB的垂线交A
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AB是半圆O.的直径C.为半圆上一点N.是线段BC上一点不与B.﹑C.重合过N.作AB的垂线交A
如图点D.为⊙O上一点点C.在直径BA的延长线上且∠CDA=∠CBD.1判断直线CD和⊙O的位置关系
如图AB是⊙O的直径∠BAC=30°M是OA上一点过M作AB的垂线交AC于点N交BC的延长线于点E直
如图点D.为⊙O.上的一点点C.在直径BA的延长线上并且∠CDA=∠CBD.1求证CD是⊙O.的切线
如图AB是⊙O.的直径∠BAC=30°M.是OA上一点过M.作AB的垂线交AC于点N.交BC的延长线
如图AC为⊙O.的直径B.为⊙O.上一点∠ACB=30°延长CB至点D.使得CB=BD过点D.作DE
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
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