What are the missing parts that correctly complete the proof?

given: point p is on the perpendicular bisector of segment a b. prove: point p is equidistant from the endpoints of segment a b. art: a horizontal line segment a b with x as the midpoint is drawn. a vertical line x p is drawn. p is above the horizontal line. the angle p x b is labeled as a right angle. the line segments a x and b 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 p with point b.

drag the answers into the boxes to correctly complete the proof.
statement reason
1. point p is on the perpendicular bisector of ab. given
2. definition of bisector
3. ∠pxa and ∠pxb are right angles.
4. all right angles are congruent.
5. px≅px reflexive property of congruence
6. sas congruency postulate
7. corresponding parts of congruent triangles are congruent.
8. point p is equidistant from the endpoints of ab. definition of equidis