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如图，点O在直线AB上，CO⊥DO于点O，若∠1=145°，则∠3的度数为（ ）
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如图AB是⊙O的一条弦点C.是⊙O优弧AB上一动点且∠ACB=45°点EF.分别是ACBC的中点直线
如图A.B是圆O上的两点且AB的长度小于圆O的直径直线l与AB垂于点D且与圆O相切于点C.若AB=2
已知点O.到△ABC的两边ABAC所在直线的距离相等且OB=OC.1如图1若点O.在边BC上求证AB
如图AB是⊙O.的直径点D.在AB的延长线上点C.在⊙O.上CA＝CD∠CDA＝30°.1试判断直线
如图AB是⊙O的直径点D在AB的延长线上点C在⊙O上CA=CD∠ACD=120°．1试探究直线CD与
如图已知AB是⊙O.的直径过点A.作⊙O.的切线MAP.为直线MA上一动点以点P.为圆心PA为半径作
如图点C.E.分别在直线ABDF上CF和BE相交于点O.CO＝FOEO＝BO.1求证△COB≌△FO
如图已知点O在直线AB上CO⊥DO于点O若∠1=145°则∠3的度数为
35°
45°
55°
65°
下面说法正确的有
若C为⊙O上的一点，则过点C的直线与⊙O必相切
直线与圆最多有两个公共点
若A．B是⊙O外两点，则直线AB与⊙O相离
若C为⊙O外一点，则过点C的直线与⊙O必相离
已知AB是半圆O.的直径点C.是半圆O.上的动点点D.是线段AB延长线上的动点在运动过程中保持CD=
如图AB是⊙O.的直径C.是⊙O.上的一点直线MN经过点C.过点A.作直线MN的垂线垂足为点D.且∠
已知如图直线AB经过⊙O.上的点C.OA与⊙O.交于点D.若OA=OBAD=CD∠A.=30°1求证
如图AB为⊙O.的直径AB=2点在M.在QO上MC垂直平分OA点N.为直线AB上一动点N.不与A.重
如图2714已知AB是⊙O.的直径点C.是⊙O.上一点连接BCAC过点C.作直线CD⊥AB于点D.
已知点O.到△ABC的两边ABAC所在直线的距离相等且OB＝OC.1如图1若点O.在BC上求证AB＝
已知点O.到△ABC的两边ABAC所在直线的距离相等且OB＝OC1如图1若点O.在BC上求证AB＝A
如图直线l与⊙O.相离过点O.作OA⊥l垂足为A.OA交⊙O.于点B.点C.在直线l上连接CB并延长
如图Rt△ABC中∠ABC=90°以AB为直径作⊙O.点D.为⊙O.上一点且CD=CB连接DO并延长
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
如图在⊙O.中直径AB⊥CD垂足为E.点M.在OC上AM的延长线交⊙O.于点G.交过C.的直线于F.
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