Use the diagram to complete the proof. Given: a || b; c || d Prove: ?1 ? ?13 Statements 1. a || b; c || d 2. ?1 ? ?12 3. ?12 ? ?13 4. ?1 ? ?13 Reasons Linear Pair Postulate Transitive Property of Congruence Vertical Angle Postulate Definition of Complementary Angles Definition of Supplementary Angles Alternate Interior Angle Theorem Given Alternate Exterior Angle Theorem
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