满分5 >
初中数学试题 >
如图1,扇形AOB中,OA=10,∠AOB=36°.若固定B点,将此扇形依顺时针...
如图1,扇形AOB中,OA=10,∠AOB=36°.若固定B点,将此扇形依顺时针方向旋转,得一新扇形A′O′B,其中A点在O′B上,如图2所示,则O点旋转至O′点所经过的轨迹长度为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102412276968998/SYS201311031024122769689008_ST/images0.png)
A.π
B.2π
C.3π
D.4π
考点分析:
相关试题推荐
在Rt△ABC中,∠C=90°,BC=4cm,AC=3cm.把△ABC绕点A顺时针旋转90°后,得到△AB
1C
1,如图所示,则点B所走过的路径长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102412276968998/SYS201311031024122769689007_ST/images0.png)
A.5
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102412276968998/SYS201311031024122769689007_ST/0.png)
cm
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102412276968998/SYS201311031024122769689007_ST/1.png)
πcm
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102412276968998/SYS201311031024122769689007_ST/2.png)
πcm
D.5πcm
查看答案
如图,在△ABC中,BC=4,以点A为圆心,2为半径的⊙A与BC相切于点D,交AB于E,交AC于F,点P是⊙A上一点,且∠EPF=40°,则图中阴影部分的面积是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102412276968998/SYS201311031024122769689006_ST/images0.png)
A.4-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102412276968998/SYS201311031024122769689006_ST/0.png)
B.4-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102412276968998/SYS201311031024122769689006_ST/1.png)
C.8-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102412276968998/SYS201311031024122769689006_ST/2.png)
D.8-
查看答案
如图,等腰梯形ABCD中,AD∥BC,以A为圆心,AD为半径的圆与BC切于点M,与AB交于点E,若AD=2,BC=6,则
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102412276968998/SYS201311031024122769689005_ST/0.png)
长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102412276968998/SYS201311031024122769689005_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102412276968998/SYS201311031024122769689005_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102412276968998/SYS201311031024122769689005_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102412276968998/SYS201311031024122769689005_ST/3.png)
D.3π
查看答案
如图,边长为1的菱形ABCD绕点A旋转,当B、C两点恰好落在扇形AEF的弧EF上时,弧BC的长度等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102412276968998/SYS201311031024122769689004_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102412276968998/SYS201311031024122769689004_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102412276968998/SYS201311031024122769689004_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102412276968998/SYS201311031024122769689004_ST/2.png)
D.
查看答案
如图,底面半径为1,母线长为4的圆锥,一只小蚂蚁若从A点出发,绕侧面一周又回到A点,它爬行的最短路线长是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102412276968998/SYS201311031024122769689003_ST/images0.png)
A.2π
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102412276968998/SYS201311031024122769689003_ST/0.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102412276968998/SYS201311031024122769689003_ST/1.png)
D.5
查看答案