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AB是⊙O的直径,点C在圆上,∠ABC=65°,那么∠OCA的度数是( )
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如图圆O.上一点C.在直径AB上的射影为D.点D.在半径OC上的射影为E.若AB=3AD则的值为__
如图AB是⊙O.的直径C.D.是⊙O.上两点CD⊥AB如果∠DAB=65°那么∠
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如图四边形ABCD内接于圆O.且AD是圆O.的直径DC与AB的延长线相交于E.点OC∥AB.1求证A
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如图AB是圆O.的直径点C.在圆上CD⊥AB于点D.DE//BC则图中与△ABC相似的三角形共有个.
如图AB是⊙O.的直径C.D.是⊙O.上两点CD⊥AB如果∠DAB=65°那么∠
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如图AB是圆O的直径点CD在圆O上∠ABC=65°则∠D的度数是
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50°
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如图AB是圆O.的弦OC⊥AB交圆O.于点C.连接OAOBBC若∠ABC=20°则∠AOB的度数是
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