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What is the justification for the second step (Reason 2)?

Alternate Interior Angles Theorem


Converse of the Alternate Interior Angles Theorem


Definition of a parallelogram


SAS Congruence Postulate

What is the justification for the second step (Reason 2)? Alternate Interior Angles-example-1
User Zamotic
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can someone tell me reason 6 and 4

User Tom Pantelis
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1) Alternate Interior Angles Theorem
User Harry Bomrah
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