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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

Grade:12

1 Answers

Arun
25750 Points
4 years ago
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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