满分5 >
初中数学试题 >
下列命题中为真命题的是( ) A.有一个角是40°的两个等腰三角形相似 B.三点...
下列命题中为真命题的是( )
A.有一个角是40°的两个等腰三角形相似
B.三点一定可以确定一个圆
C.圆心角的度数相等,则圆心角所对的弧相等
D.三角形的内心到三角形三边距离相等
考点分析:
相关试题推荐
如图,⊙O的直径为10cm,弦AB为8cm,P是弦AB上一点,若OP的长为整数,则满足条件的点P有( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452020420721/SYS201311031024520204207007_ST/images0.png)
A.2个
B.3个
C.4个
D.5个
查看答案
如图,CD是圆O的弦,AB是圆O的直径,CD=8,AB=10,则点A、B到直线CD的距离的和是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452020420721/SYS201311031024520204207006_ST/images0.png)
A.6
B.8
C.10
D.12
查看答案
如图,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452020420721/SYS201311031024520204207005_ST/0.png)
是半径为1的圆弧,△AOC为等边三角形,D是
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452020420721/SYS201311031024520204207005_ST/1.png)
上的一动点,则四边形AODC的面积s的取值范围是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452020420721/SYS201311031024520204207005_ST/images2.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452020420721/SYS201311031024520204207005_ST/2.png)
≤s≤
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452020420721/SYS201311031024520204207005_ST/3.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452020420721/SYS201311031024520204207005_ST/4.png)
<s≤
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452020420721/SYS201311031024520204207005_ST/5.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452020420721/SYS201311031024520204207005_ST/6.png)
≤s≤
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452020420721/SYS201311031024520204207005_ST/7.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452020420721/SYS201311031024520204207005_ST/8.png)
<s<
查看答案
如图,在半径为1的⊙O中,直径AB把⊙O分成上、下两个半圆,点C是上半圆上一个动点(C与点A、B不重合),过点C作弦CD⊥AB,垂足为E,∠OCD的平分线交⊙O于点P,设CE=x,AP=y,下列图象中,最能刻画y与x的函数关系的图象是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452020420721/SYS201311031024520204207004_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452020420721/SYS201311031024520204207004_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452020420721/SYS201311031024520204207004_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452020420721/SYS201311031024520204207004_ST/images3.png)
D.
查看答案
如图,⊙M与x轴相交于点A(2,0)、B(8,0),与y轴相切于点C,则圆心M的坐标是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102452020420721/SYS201311031024520204207003_ST/images0.png)
A.(3,5)
B.(5,3)
C.(4,5)
D.(5,4)
查看答案