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如图,现有一扇形纸片,圆心角∠AOB为120°,弦AB的长为2cm,用它围成一个...
如图,现有一扇形纸片,圆心角∠AOB为120°,弦AB的长为2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452019747872/SYS201311031024520197478012_ST/0.png)
cm,用它围成一个圆锥的侧面(接缝忽略不计),则该圆锥底面圆的半径为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452019747872/SYS201311031024520197478012_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452019747872/SYS201311031024520197478012_ST/1.png)
cm
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452019747872/SYS201311031024520197478012_ST/2.png)
πcm
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452019747872/SYS201311031024520197478012_ST/3.png)
cm
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452019747872/SYS201311031024520197478012_ST/4.png)
πcm
考点分析:
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