What are the missing parts that correctly complete the proof?

given: point a is on the perpendicular bisector of segment p q. prove: point a is equidistant from the endpoints of segment p q. image: a horizontal line segment p q. a midpoint is drawn on segment p q labeled as x. a vertical line x a is drawn. a is above the horizontal line. the angle a x q is labeled a right angle. the line segments p x and q x are labeled with a single tick mark. a dotted line is used to connect point p with point a. another dotted line is used to connect point q with point a. drag the answers into the boxes to correctly complete the proof.