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(2006•荆州)有一张矩形纸片ABCD,其中AD=4cm,上面有一个以AD为直...
(2006•荆州)有一张矩形纸片ABCD,其中AD=4cm,上面有一个以AD为直径的半园,正好与对边BC相切,如图(甲).将它沿DE折叠,是A点落在BC上,如图(乙).这时,半圆还露在外面的部分(阴影部分)的面积是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230651758694739/SYS201310212306517586947009_ST/images0.png)
A.(π-2
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)cm
2B.(
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π+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230651758694739/SYS201310212306517586947009_ST/2.png)
)cm
2C.(
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π-
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)cm
2D.(
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π+
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)cm
2
考点分析:
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