2. ∠STR ≅ ∠STP
3. Definition of Perpendicular
4. ∠SRT ≅ ∠SPT
5. segment ST ≅ segment ST 5. Reflexive Property
6. ΔSRT ≅ ΔSPT 6. AAS Triangle Congruence Theorem
7. segment SP ≅ segment SR 7. CPCTC
