满分5 >
初中数学试题 >
已知一个正六边形的半径是r,则此正六边形的周长是( ) A.3r B.6r C....
已知一个正六边形的半径是r,则此正六边形的周长是( )
A.3r
B.6r
C.12r
D.24r
考点分析:
相关试题推荐
如图,P为正三角形ABC外接圆上一点,则∠APB=( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100910581253479/SYS201311031009105812534020_ST/images0.png)
A.150°
B.135°
C.115°
D.120°
查看答案
某公园的两个花圃,面积相等,形状分别为正三角形和正六边形,已知正三角形花圃的周长为50米,则正六边形花圃的周长( )
A.大于50米
B.等于50米
C.小于50米
D.无法确定
查看答案
若同一个圆的内接正三角形、正方形、正六边形的边心距分别为r
3,r
4,r
6,则r
3:r
4:r
6等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100910581253479/SYS201311031009105812534018_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100910581253479/SYS201311031009105812534018_ST/1.png)
C.1:2:3
D.3:2:1
查看答案
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100910581253479/SYS201311031009105812534017_ST/images0.png)
如图,若正方形A
1B
1C
1D
1内接于正方形ABCD的内接圆,则
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100910581253479/SYS201311031009105812534017_ST/0.png)
的值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100910581253479/SYS201311031009105812534017_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100910581253479/SYS201311031009105812534017_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100910581253479/SYS201311031009105812534017_ST/3.png)
D.
查看答案
圆内接正方形的边长为
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100910581253479/SYS201311031009105812534016_ST/0.png)
cm,则该圆的半径为( )
A.1cm
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100910581253479/SYS201311031009105812534016_ST/1.png)
cm
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100910581253479/SYS201311031009105812534016_ST/2.png)
cm
D.2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100910581253479/SYS201311031009105812534016_ST/3.png)
m
查看答案