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如图,AB是半圆O的直径,以0A为直径的半圆O′与弦AC交于点D,O′E∥AC,...
如图,AB是半圆O的直径,以0A为直径的半圆O′与弦AC交于点D,O′E∥AC,并交OC于点E.则下列四个结论:
①点D为AC的中点;②S
△O′OE=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185906706963891/SYS201311011859067069638014_ST/0.png)
S
△AOC;③
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185906706963891/SYS201311011859067069638014_ST/1.png)
;④四边形O′DEO是菱形.其中正确的结论是
.(把所有正确的结论的序号都填上)
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185906706963891/SYS201311011859067069638014_ST/images2.png)
考点分析:
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