从圆x^2+y^2+6x+2y-1=0外一点P(1,1)向圆引切线PT(T是切点),则PT=?
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从圆x^2+y^2+6x+2y-1=0外一点P(1,1)向圆引切线PT(T是切点),则PT=?从圆x^2+y^2+6x+2y-1=0外一点P(1,1)向圆引切线PT(T是切点),则PT=?从圆x^2+
从圆x^2+y^2+6x+2y-1=0外一点P(1,1)向圆引切线PT(T是切点),则PT=?
从圆x^2+y^2+6x+2y-1=0外一点P(1,1)向圆引切线PT(T是切点),则PT=?
从圆x^2+y^2+6x+2y-1=0外一点P(1,1)向圆引切线PT(T是切点),则PT=?
x^2+y^2+6x+2y-1=0可化为普通方程:(x+3)^2+(y+1)^2=11
因为PT为圆的切线,连接圆心和T可得出(设圆心为M)
MT垂直于PT
M(-3,-1) P(1,1),可求出MP=根号下(4^2+2^2)=2倍根号5
利用勾股定理可得PT=根号下(2倍根号5^2+根号11的平方)=3
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