满分5 >
初中数学试题 >
如图,⊙O过点B、C.圆心O在等腰直角△ABC的内部,∠BAC=90°,OA=1...
如图,⊙O过点B、C.圆心O在等腰直角△ABC的内部,∠BAC=90°,OA=1,BC=6,则⊙O的半径为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089778021/SYS201311031008350897780006_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089778021/SYS201311031008350897780006_ST/0.png)
B.2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089778021/SYS201311031008350897780006_ST/1.png)
C.3
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089778021/SYS201311031008350897780006_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089778021/SYS201311031008350897780006_ST/3.png)
考点分析:
相关试题推荐
如图,AB是⊙O的直径,CD为弦,CD⊥AB于E,则下列结论中不成立的是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089778021/SYS201311031008350897780005_ST/images0.png)
A.∠A=∠D
B.CE=DE
C.∠ACB=90°
D.CE=BD
查看答案
如图,直线与两个同心圆分别相交于图示的各点,则正确的是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089778021/SYS201311031008350897780004_ST/images0.png)
A.MP与RN的大小关系不定
B.MP=RN
C.MP<RN
D.MP>RN
查看答案
如图,AB是⊙O的直径,C是⊙O上的一点,若AC=8,AB=10,OD⊥BC于点D,则BD的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089778021/SYS201311031008350897780003_ST/images0.png)
A.1.5
B.3
C.5
D.6
查看答案
如图,⊙O的直径AB=10cm,弦CD⊥AB,垂足为P.若OP:OB=3:5,则CD的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089778021/SYS201311031008350897780002_ST/images0.png)
A.6cm
B.4cm
C.8cm
D.10cm
查看答案
如图,MN是⊙O的直径,MN=2,点A在⊙O上,∠AMN=30°,B为
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089778021/SYS201311031008350897780001_ST/0.png)
的中点,P是直径MN上一动点,则PA+PB的最小值为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089778021/SYS201311031008350897780001_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089778021/SYS201311031008350897780001_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835089778021/SYS201311031008350897780001_ST/2.png)
C.1
D.2
查看答案