Answer: (A) ASA
Proof:
Statement Reason
1. ∠S ≅ ∠U 1. Given (both are right angles)
2. ST ≅ UT 2. Given (tick marks in image)
3. ∠STR ≅ ∠UTV 3. Vertical angles
4. ΔSTR ≅ ΔUTV 4. Angle-Side-Angle Postulate
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