1. ∠1 ≅ ∠2 1. Given
2. ∠1 ≅ ∠3 2. Vertical Angle Theorem
∠2 ≅ ∠4
3. ∠2 ≅ ∠3 3. Transitive Property refer to Statements 1 & 2
4. ∠3 ≅ ∠4 4. Transitive Property refer to Statements 3 & 2
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