Q. The square of the length of the tangent from $(3,\ - 4)$ to the circle $x^{2} + y^{2} - 4x - 6y + 3 = 0$, is
A) 20
B) 30
C) 40
D) 50
Explanation
(c)
Required length of tangent from the point $(3,\ - 4)$ to the circle $x^{2} + y^{2} - 4x - 6y + 3 = 0$
$= \sqrt{3^{2} + 4^{2} - 4(3) - 6( - 4) + 3} = \sqrt{40}$
$\therefore$ Square of length of tangent =40
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.