1. Tardigrade
  2. Question
  3. Mathematics
  4. ℓ x+m y+n=0 is a tangent line to the circle x2+y2=r2, if -

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. $\ell x+m y+n=0$ is a tangent line to the circle $x^2+y^2=r^2$, if -

Conic Sections

Solution:

Correct answer is (c) $n^2=r^2\left(\ell^2+m^2\right)$