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(2002•绍兴)边长为a的正六边形的边心距为( ) A.a B. C. D.2...
(2002•绍兴)边长为a的正六边形的边心距为( )
A.a
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768788637/SYS201310212325507687886022_ST/0.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768788637/SYS201310212325507687886022_ST/1.png)
D.2a
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