Is the angle bisector of yex and the perpendicular bisector of . is the angle bisector of ygz and the perpendicular bisector of . is the angle bisector of zfx and the perpendicular bisector of . point a is the intersection of , , and . which must be true? point a is the center of the circle that passes through points e, f, and g but is not the center of the circle that passes through points x, y, and z. point a is the center of the circle that passes through points x, y, and z but is not the center of the circle that passes through points e, f, and g. point a is the center of the circle that passes through points e, f, and g and the center of the circle that passes through points x, y, and z. point a is not necessarily the center of the circle that passes through points e, f, and g or the center of the circle that passes through points x, y, and z.