O
1. ZTVS and RVS are right angles (given)
2. ZTVS RVS (Right Z Thm.)
3. V is midpoint of TR (given)
4. TV ≈ VR (Def. of midpoint)
5. TSRS (given)
6. VS bisects ZRST (given)
7.ZTSV
RSV (Def. of bisector)
A
8. VS SV (Reflex. Prop. of ≈)
9. LT/R (Third angles Thm.)
10. ATSVA RSV (Def. of congruent triangles)