Answer: ASA (angle, side, angle)
Step-by-step explanation:
1) ∠HRI congruent to ∠SRQ (Vertical Angles)
2) SR congruent to RI (definition of midpoint)
3) ∠H congruent to ∠Q; ∠I congruent to ∠S (alternate interior angles/given)
4) Triangle RQS= Triangle RHI (ASA)