Locus  of the point of intersection of perpendicular  tangents to the circle ` x^(2)+y^(2)=16` is

Locus of the point of intersection of perpendicular tangents to the circle ` x^(2)+y^(2)=16` is

Locus of the point of intersection of perpendicular tangents to the circle ` x^(2)+y^(2)=16` is