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已知正六边形的边长为12cm,则这个正六边形的边心距是( ) A.6cm B.1...
已知正六边形的边长为12cm,则这个正六边形的边心距是( )
A.6cm
B.12cm
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102458338821909/SYS201311031024583388219008_ST/0.png)
cm
D.12
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102458338821909/SYS201311031024583388219008_ST/1.png)
cm
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A.2:1
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C.
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D.3:1
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圆内接正方形的面积为a,则圆的面积为( )
A.2πa
B.
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D.以上都不对
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已知正三角形的边长为a,其内切圆的半径为r,外接圆的半径为R,则r:a:R等于( )
A.1:2
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B.1:2:2
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D.1:
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如图,P为正三角形ABC外接圆上一点,则∠APB=( )
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A.150°
B.135°
C.115°
D.120°
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