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(2000•甘肃)一条弧所对的圆心角是90°,半径是R,则这条弧长是( ) A....
(2000•甘肃)一条弧所对的圆心角是90°,半径是R,则这条弧长是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232724992476375/SYS201310212327249924763010_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232724992476375/SYS201310212327249924763010_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232724992476375/SYS201310212327249924763010_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232724992476375/SYS201310212327249924763010_ST/3.png)
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