Ketaki M. answered 08/20/15
Tutor
New to Wyzant
Ketaki M Math,SAT,ACT.GRE,AP CAlculus
director circle for a circle is defined as the locus of all those points such that tangents from them to the given circle will all be perpendicular to each other.
think like this
you have a circle C . from any point outside the circle C ,you can draw two tangents to the circle.
if the angle between those 2 tangents is 90 degrees ,then that point will lie on the director circle