满分5 >
初中数学试题 >
将一块弧长为π的半圆形铁皮围成一个圆锥(接头忽略不计),则围成的圆锥的高为( )...
将一块弧长为π的半圆形铁皮围成一个圆锥(接头忽略不计),则围成的圆锥的高为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100917849238148/SYS201311031009178492381008_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100917849238148/SYS201311031009178492381008_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100917849238148/SYS201311031009178492381008_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100917849238148/SYS201311031009178492381008_ST/3.png)
考点分析:
相关试题推荐
如图是一个零件示意图,A、B、C处都是直角,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100917849238148/SYS201311031009178492381007_ST/0.png)
是圆心角为90°的弧,其大小尺寸如图标示.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100917849238148/SYS201311031009178492381007_ST/1.png)
的长是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100917849238148/SYS201311031009178492381007_ST/images2.png)
A.π
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100917849238148/SYS201311031009178492381007_ST/2.png)
π
C.2π
D.4π
查看答案
在半径为1的⊙O中,弦AB=1,则
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100917849238148/SYS201311031009178492381006_ST/0.png)
的长是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100917849238148/SYS201311031009178492381006_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100917849238148/SYS201311031009178492381006_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100917849238148/SYS201311031009178492381006_ST/3.png)
D.
查看答案
若一个圆锥的母线长是它底面半径的3倍,则它的侧面展开图的圆心角等于( )
A.120°
B.135°
C.150°
D.180°
查看答案
如图,主视图为等边三角形的圆锥,它的侧面展开图扇形的圆心角为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100917849238148/SYS201311031009178492381004_ST/images0.png)
A.240°
B.180°
C.120°
D.90°
查看答案
如图,在图1所示的正方形铁皮上剪下一个圆形和扇形,使之恰好围成图2所示的一个圆锥模型.设圆的半径为r,扇形的半径为R,则圆的半径与扇形的半径之间的关系为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100917849238148/SYS201311031009178492381003_ST/images0.png)
A.R=2r
B.R=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100917849238148/SYS201311031009178492381003_ST/0.png)
r
C.R=3r
D.R=4r
查看答案