满分5 >
高中数学试题 >
湖面上漂着一球,湖结冰后将球取出,冰面上留下了一个直径为24cm,深为8cm的空...
湖面上漂着一球,湖结冰后将球取出,冰面上留下了一个直径为24cm,深为8cm的空穴,则该球的表面积为( )
A.64π
B.320π
C.576π
D.676π
考点分析:
相关试题推荐
如图,平面四边形ABCD中,AB=AD=CD=1,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327787366/SYS201310251237333277873008_ST/0.png)
,将其沿对角线BD折成四面体A′-BCD,使平面A′BD⊥平面BCD,若四面体A′-BCD顶点在同一个球面上,则该球的体积为( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327787366/SYS201310251237333277873008_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327787366/SYS201310251237333277873008_ST/1.png)
B.3π
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327787366/SYS201310251237333277873008_ST/2.png)
D.2π
查看答案
在正四面体ABCD的面上,到棱AB以及C、D两点的距离都相等的点共有( )
A.1个
B.2个
C.3个
D.4个
查看答案
正四棱锥的侧棱长与底面边长都是1,则侧棱与底面所成的角为( )
A.75°
B.60°
C.45°
D.30°
查看答案
向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327787366/SYS201310251237333277873005_ST/0.png)
=(-2,-3,1),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327787366/SYS201310251237333277873005_ST/1.png)
=(2,0,4),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327787366/SYS201310251237333277873005_ST/2.png)
=(-4,-6,2),下列结论正确的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327787366/SYS201310251237333277873005_ST/3.png)
∥
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327787366/SYS201310251237333277873005_ST/4.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327787366/SYS201310251237333277873005_ST/5.png)
⊥
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327787366/SYS201310251237333277873005_ST/6.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327787366/SYS201310251237333277873005_ST/7.png)
∥
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327787366/SYS201310251237333277873005_ST/8.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327787366/SYS201310251237333277873005_ST/9.png)
⊥
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327787366/SYS201310251237333277873005_ST/10.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327787366/SYS201310251237333277873005_ST/11.png)
∥
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327787366/SYS201310251237333277873005_ST/12.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327787366/SYS201310251237333277873005_ST/13.png)
⊥
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327787366/SYS201310251237333277873005_ST/14.png)
D.以上都不对
查看答案
在正三棱锥P-ABC(顶点在底面的射影是底面正三角形的中心)中,AB=4,PA=8,过A作与PB,PC分别交于D和E的截面,则截面△ADE的周长的最小值是( )
A.9
B.10
C.11
D.12
查看答案