Find the inverse point of (-2,3) with respect to the circle x^2+y^2-4x-6y+9=0
Find the inverse point of (-2,3) with respect to the circle x^2+y^2-4x-6y+9=0
Hemanjalee , 4 Years ago
Grade 12
Analytical Geometry> Find the inverse point of (-2,3) with res...
1 Answers
Ram Kushwah
Last Activity: 4 Years ago
The equation of the circle is
x²+y²-4x-6y+9=0
This can be written as
(x-2)²+(y-3)²=4=2²
so centre of circle is O (2 3) and radius r =2
Now let a point P(h,k ) is a inverse of poin A (-2,3) w.r.t. circle
x²+y²-4x-6y+9=0
So OP x OA=r²=4
Now OA=√{ (2+2)²+(3-3)²}=√4²=4
Thus OP x 4=4
OP=1
OP²=1......................(1)
Now equation of OA is:
y-3=(3-3)/(-2-2) *(x-2)
y-3=0
y=3
P (h,k) lies on OP
so k=3
From(1)
OP²=1
(h-2)²+(k-3)²=1
(h-2)²+(3-3)²=1
(h-2)²=1
h-2=±1
h=3 or 1
Thus the points are (1,3 ) or (3,3)
But point P is same side of point A that is possible only(1,3)
Thus point P is (1,3)
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