满分5 >
初中数学试题 >
如图,MN为⊙O的弦,∠M=30°,则∠MON等于( ) A.30° B.60°...
如图,MN为⊙O的弦,∠M=30°,则∠MON等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089562906/SYS201311031008350895629009_ST/images0.png)
A.30°
B.60°
C.90°
D.120°
考点分析:
相关试题推荐
如图,⊙O的半径为5,弦AB长为8,过AB的中点E有一动弦CD(点C只在
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089562906/SYS201311031008350895629008_ST/0.png)
上运动,且不与A、B重合),设EC=x,ED=y,下列能够表示y与x之间函数关系的图象是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089562906/SYS201311031008350895629008_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089562906/SYS201311031008350895629008_ST/images2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089562906/SYS201311031008350895629008_ST/images3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089562906/SYS201311031008350895629008_ST/images4.png)
D.
查看答案
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089562906/SYS201311031008350895629007_ST/images0.png)
如图,⊙O上有两点A与P,若P点在圆上匀速运动一周,那么弦AP的长度d与时间t的关系可能是下列图形中的( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089562906/SYS201311031008350895629007_ST/images1.png)
A.①
B.③
C.②或④
D.①或③
查看答案
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089562906/SYS201311031008350895629006_ST/images0.png)
如图,A,B,C,D为⊙O的四等分点,动点P从圆心O出发,沿O-C-D-O路线作匀速运动,设运动时间为t(s).∠APB=y(°),则下列图象中表示y与t之间函数关系最恰当的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089562906/SYS201311031008350895629006_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089562906/SYS201311031008350895629006_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089562906/SYS201311031008350895629006_ST/images3.png)
D.
查看答案
在平面直角坐标系内存在⊙A,A(b,0),⊙A交x轴于O(0,0)、B(2b,0),在y轴上存在一动点C(C不与原点O重合),直线l始终过A、C,直线l交⊙A于E、F,在半圆EF上存在一点动点D且D不与E、F重合,则S
△DEA的最大值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089562906/SYS201311031008350895629005_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089562906/SYS201311031008350895629005_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089562906/SYS201311031008350895629005_ST/2.png)
D.无法判断
查看答案
如图,在平面直角坐标系中,点A在第一象限,⊙A与x轴相切于B,与y轴交于C(0,1),D(0,4)两点,则点A的坐标是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089562906/SYS201311031008350895629004_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089562906/SYS201311031008350895629004_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089562906/SYS201311031008350895629004_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089562906/SYS201311031008350895629004_ST/2.png)
D.
查看答案