Chord of contact
Ellipse of Class 11
Chord of Contact
Let P(x1, y1) be a point exterior to the ellipse S ≡ 
− 1 = 0. Then the equation of the chord of contact is T = 0. i.e. 
+ 
− 1 = 0.
Equation of chord In Mid−Point form
Equation of the chord whose mid−point is (x1, y1) is T = S1. i.e. 
= 
