满分5 >
初中数学试题 >
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( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931193624/SYS201311031024469311936005_ST/images0.png)
A.4cm
B.3cm
C.2cm
D.1cm
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/20131103102446931193624/SYS201311031024469311936004_ST/images0.png)
A.5
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931193624/SYS201311031024469311936004_ST/0.png)
cm
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931193624/SYS201311031024469311936004_ST/1.png)
πcm
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931193624/SYS201311031024469311936004_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/20131103102446931193624/SYS201311031024469311936003_ST/images0.png)
A.4-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931193624/SYS201311031024469311936003_ST/0.png)
B.4-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931193624/SYS201311031024469311936003_ST/1.png)
C.8-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931193624/SYS201311031024469311936003_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/20131103102446931193624/SYS201311031024469311936002_ST/0.png)
长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931193624/SYS201311031024469311936002_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931193624/SYS201311031024469311936002_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931193624/SYS201311031024469311936002_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931193624/SYS201311031024469311936002_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/20131103102446931193624/SYS201311031024469311936001_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931193624/SYS201311031024469311936001_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931193624/SYS201311031024469311936001_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931193624/SYS201311031024469311936001_ST/2.png)
D.
查看答案
如图,小明从半径为5cm的圆形纸片中剪下40%圆周一个扇形,然后利用剪下的扇形制作成一个圆锥形玩具纸帽(接缝处不重叠),那么这个圆锥的高为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931193624/SYS201311031024469311936000_ST/images0.png)
A.3cm
B.4cm
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931193624/SYS201311031024469311936000_ST/0.png)
D.
查看答案