已知点M0(x0,y0)和圆(x-a)^2+(y-b)^2=r^2,则

问题描述:

已知点M0(x0,y0)和圆(x-a)^2+(y-b)^2=r^2,则
点M0(x0,y0)在圆内 等价于______________________________
点M0(x0,y0)在圆上 等价于 _____________________________
点M0(x0,y0)在圆外 等价于 ______________________________

点M0(x0,y0)在圆内 等价于(x0-a)^2+(y0-b)^2<r^2,
点M0(x0,y0)在圆上 等价于(x0-a)^2+(y0-b)^2=r^2,
点M0(x0,y0)在圆外 等价于(x0-a)^2+(y0-b)^2>r^2,