The missing statement in the proof is:
∠OQS≅∠RQS
This is necessary to establish that the angles are congruent before applying the SAS (Side-Angle-Side) Congruence Theorem. So the completed proof would read:
Statement | Reason
- TP¯¯¯¯¯¯¯ is a perpendicular bisector of OR¯¯¯¯¯¯¯. | given
- OQ¯¯¯¯¯¯¯≅RQ¯¯¯¯¯¯¯¯. | definition of a perpendicular bisector
- ∠OQS and ∠RQS are right angles. | definition of a perpendicular bisector
- ∠OQS≅∠RQS | Right Angle Congruence Theorem
- SQ¯¯¯¯¯¯¯≅SQ¯¯¯¯¯¯¯ | Reflexive Property of Congruence
- △OQS≅△RQS | SAS Congruence Theorem
- SO¯¯¯¯¯¯¯≅SR¯¯¯¯¯¯¯ | CPCTC Theorem
Thus, the answer is ∠OQS≅∠RQS.