Grade 12Analytical Geometry
Show that the line lx+my+n=0 is normal to the circle if and only if gl+mf=n
Show that the line lx+my+n=0 is normal to the circle if and only if gl+mf=n
1 Answer
Arun
Dear Suman
if equatio
if Equation of circle is-
x^2 + y^2 + 2gx + 2fy + c = 0
then
normal lx + my + n akwwys passes through its centre
hence
-lg - mf + n = 0
hence
lg + mf = n
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