2 thoughts on “Chord of Contact & Geometrical Properties”

1. Sir, in patel textbook, it says that the equation for chord of contact of a rectangular hyperbola is xx1 + yy1 = 2(c^2)…why is it different from yours??

   thanks!

2. You know I’ve never noticed that before.

   The simple answer is that Patel has it wrong (or more likely it is a misprint)

   Remember: tangents and chords of contact will look like the equation of the conic

   xy0+x0y =2c^2 looks like xy + xy =2c^2 -> 2xy = 2c^2 -> xy = c^2