Question

20.
A straight line moves such that the algebraic
sum of the perpendicular drawn to it from
two fixed points is equal to 2k. Then the
straight line always touches a fixed circle
of radius :
(b) k/2
(c) k
(d) none of these
(a) 2k

Answer 1

Answer:

Answer is (d) none of these

Answer 2

Answer:

Given that the algebraic sum of the perpendicular drawn from to fixed points  =2k  

Such that 2k=2r

The perpendicular drawn to the center of the circle,such that they are equal to the radius of circle

⇒  2k=2r

∴ k =r

∴  Fixed radius of circle  = k