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Mathematics 7 Online
OpenStudy (anonymous):

What is the reason for step 3 of this proof?

OpenStudy (anonymous):

OpenStudy (anonymous):

What is the reason for step 3 of this proof? Alternate Interior Angles Theorem Corresponding angles in congruent triangles are congruent. For parallel lines cut by a transversal, corresponding angles are congruent. Vertical Angles Theorem SAS criterion for congruence

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