The locus of the point P such that \[\angle APB={{90}^{\circ }}\], with AB as diameter of the circle.
AB is fixed line, so we need to state that the locus of the point P such that \[\angle APB={{90}^{\circ }}\]
The locus of the point P such that \[\angle APB={{90}^{\circ }}\], with AB as diameter of the circle.