直线x+2y+1=0被圆(x-2)
2+(y-1)
2=25所截得的弦长等于( )
A. 2
B. 3
C. 4
D. 5
人气:313 ℃ 时间:2019-12-03 01:47:32
解答
圆心(2,1)到直线x+2y+1=0的距离为d=
=
,圆的半径r=5,
故弦长为 2
=4
,
故选:C.
推荐
猜你喜欢
- 妈妈说:“今晚我加班,你们先吃饭吧!”改为第三人称的转述
- Bill likes ___ (eat)different kinds of food
- how far is it from shanghai to beijing?答句
- 根据句意、首字母及英文释义填写单词,使句子完整、通顺
- π-π共轭,p-π共轭,σ-π超共轭 σ-p超共轭间的区别,最好举几个例子?
- 如图,四棱锥S-ABCD的地面时边长为a的正方形,SD⊥底面ABCD,且SD=a,E为SC中点,求三
- 一条电线截去4分之1,接上12米后,比原来长了3分之1,这条电线原来长多少米
- 翻译I have the car serviced every three months