如图,AB是⊙O的直径,∠COB=70°,则∠A=
度.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190049618672380/SYS201311011900496186723011_ST/images0.png)
考点分析:
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如图,在菱形ABCD中,∠A=60°,E、F分别是AB、AD的中点,若EF=2,则菱形ABCD的边长是
.
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在平行四边形ABCD中,点A
1,A
2,A
3,A
4和C
1,C
2,C
3,C
4分别AB和CD的五等分点,点B
1,B
2和D
1,D
2分别是BC和DA的三等分点,已知四边形A
4B
2C
4D
2的面积为1,则平行四边形ABCD面积为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190049618672380/SYS201311011900496186723009_ST/images0.png)
A.2
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190049618672380/SYS201311011900496186723009_ST/0.png)
C.
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D.15
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如图,已知扇形OBC,ODA的半径之间的关系是
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190049618672380/SYS201311011900496186723008_ST/0.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190049618672380/SYS201311011900496186723008_ST/1.png)
的长是
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190049618672380/SYS201311011900496186723008_ST/2.png)
长的( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190049618672380/SYS201311011900496186723008_ST/images3.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190049618672380/SYS201311011900496186723008_ST/3.png)
倍
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190049618672380/SYS201311011900496186723008_ST/4.png)
倍
C.2倍
D.4倍
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抛物线y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190049618672380/SYS201311011900496186723007_ST/0.png)
(x-2)
2-3的顶点坐标是( )
A.(-2,-3)
B.(2,3)
C.(-2,3)
D.(2,-3)
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在平面直角坐标系中,已知点A(0,2),B(-2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190049618672380/SYS201311011900496186723006_ST/0.png)
,0),C(0,-2),D(2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190049618672380/SYS201311011900496186723006_ST/1.png)
,0),则以这四个点为顶点的四边形ABCD是( )
A.矩形
B.菱形
C.正方形
D.梯形
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