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如图,现有一圆心角为90°,半径为8cm的扇形纸片,用它恰好围成一个圆锥的侧面(...
如图,现有一圆心角为90°,半径为8cm的扇形纸片,用它恰好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
cm.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190318892516466/SYS201311011903188925164012_ST/images0.png)
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