圆心为(2,3)且与直线X+Y-1=0相切的圆的方程是
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C= (2,3)
x+y-1 = 0 (1)
y = -x +1
slope = -1
r = distance between (2,3) and the line x+y-1=0
let M be a point on the line x+y-1=0 such that CM perpendicular to the line x+y-1=0
equation of CM
(y-3)/(x-2) = 1
x-y+1 =0 (2)
(1) +(2)
2x = 0
x=0
y =1
M(0,1)
r^2 = |CM|^2
= ((2-0)^2+(3-1))^2)
= 8
equation of circle:
(x-2)^2 +(y-3)^2 = 8
x+y-1 = 0 (1)
y = -x +1
slope = -1
r = distance between (2,3) and the line x+y-1=0
let M be a point on the line x+y-1=0 such that CM perpendicular to the line x+y-1=0
equation of CM
(y-3)/(x-2) = 1
x-y+1 =0 (2)
(1) +(2)
2x = 0
x=0
y =1
M(0,1)
r^2 = |CM|^2
= ((2-0)^2+(3-1))^2)
= 8
equation of circle:
(x-2)^2 +(y-3)^2 = 8
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圆心(2,3)到直线x+y-1=0的距离=|2+3-1|/√13=4/√2=2√2。
圆方程为:(x-2)^2+(y-3)^2=8。
圆方程为:(x-2)^2+(y-3)^2=8。
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