满分5 >
初中数学试题 >
如图,以三角形三个顶点为圆心画半径为2的圆,则阴影部分面积之和为( ) A.π ...
如图,以三角形三个顶点为圆心画半径为2的圆,则阴影部分面积之和为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451026_ST/images0.png)
A.π
B.2π
C.3π
D.4π
考点分析:
相关试题推荐
花园内有一块边长为a的正方形土地,园艺师设计了四种不同的图案,如下图的A、B、C、D所示,其中的阴影部分用于种植花草.种植花草部分面积最大的图案是( )(说明:A、B、C中圆弧的半径均为
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451025_ST/0.png)
,D中圆弧的半径为a)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451025_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451025_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451025_ST/images3.png)
D.
查看答案
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451024_ST/images0.png)
如图,在同心圆中,两圆半径分别为2,1,∠AOB=120°,则阴影部分的面积为( )
A.4π
B.2π
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451024_ST/0.png)
D.π
查看答案
如图,AB是⊙O的直径,点D、E是半圆的三等分点,AE、BD的延长线交于点C,若CE=2,则图中阴影部分的面积是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451023_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451023_ST/0.png)
π-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451023_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451023_ST/2.png)
π
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451023_ST/3.png)
π-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451023_ST/4.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451023_ST/5.png)
π
查看答案
有一张矩形纸片ABCD,其中AD=4cm,上面有一个以AD为直径的半园,正好与对边BC相切,如图(甲).将它沿DE折叠,是A点落在BC上,如图(乙).这时,半圆还露在外面的部分(阴影部分)的面积是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451022_ST/images0.png)
A.(π-2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451022_ST/0.png)
)cm
2B.(
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451022_ST/1.png)
π+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451022_ST/2.png)
)cm
2C.(
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451022_ST/3.png)
π-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451022_ST/4.png)
)cm
2D.(
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451022_ST/5.png)
π+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451022_ST/6.png)
)cm
2
查看答案
如图,圆心角都是90°的扇形OAB与扇形OCD叠放在一起,OA=3,OC=1,分别连接AC、BD,则图中阴影部分的面积为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451021_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102446931345108/SYS201311031024469313451021_ST/0.png)
π
B.π
C.2π
D.4π
查看答案