∵点P(a,b)(ab≠0)是圆O:x 2+y 2=r 2内一点,∴
a 2 + b 2 <半径r.
圆心(0,0)到直线ax+by+r 2=0的距离等于
|0+0+ r 2 |
a 2 + b 2 >
r 2
r =r,
故直线和圆相离,
故选A.
∵点P(a,b)(ab≠0)是圆O:x 2+y 2=r 2内一点,∴
a 2 + b 2 <半径r.
圆心(0,0)到直线ax+by+r 2=0的距离等于
|0+0+ r 2 |
a 2 + b 2 >
r 2
r =r,
故直线和圆相离,
故选A.