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有下列说法:①等弧的长度相等;②直径是圆中最长的弦;③相等的圆心角对的弧相等;④...
有下列说法:①等弧的长度相等;②直径是圆中最长的弦;③相等的圆心角对的弧相等;④圆中90°角所对的弦是直径;⑤同圆中等弦所对的圆周角相等.其中正确的有( )
A.1个
B.2个
C.3个
D.4个
考点分析:
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在一扇形统计图中,有一扇形的圆心角为60°,则此扇形占整个圆的( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102433580271094/SYS201311031024335802710021_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102433580271094/SYS201311031024335802710021_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102433580271094/SYS201311031024335802710021_ST/2.png)
D.
查看答案
下列语句中正确的是( )
A.相等的圆心角所对的弧相等
B.平分弦的直径垂直于弦
C.长度相等的两条弧是等弧
D.经过圆心的每一条直线都是圆的对称轴
查看答案
已知
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102433580271094/SYS201311031024335802710019_ST/0.png)
、
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102433580271094/SYS201311031024335802710019_ST/1.png)
是同圆的两段弧,且
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102433580271094/SYS201311031024335802710019_ST/2.png)
,则弦AB与2CD之间的关系为( )
A.AB=2CD
B.AB<2CD
C.AB>2CD
D.不能确定
查看答案
如图,BE是半径为6的圆D的
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102433580271094/SYS201311031024335802710018_ST/0.png)
圆周,C点是
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102433580271094/SYS201311031024335802710018_ST/1.png)
上的任意一点,△ABD是等边三角形,则四边形ABCD的周长P的取值范围是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102433580271094/SYS201311031024335802710018_ST/images2.png)
A.12<P≤18
B.18<P≤24
C.18<P≤18+6
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102433580271094/SYS201311031024335802710018_ST/2.png)
D.12<P≤12+6
查看答案
如图,已知AB是⊙O的直径,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102433580271094/SYS201311031024335802710017_ST/0.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102433580271094/SYS201311031024335802710017_ST/1.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102433580271094/SYS201311031024335802710017_ST/2.png)
.∠BOC=40°,那么∠AOE=( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102433580271094/SYS201311031024335802710017_ST/images3.png)
A.40°
B.60°
C.80°
D.120°
查看答案