The angle ∠3 = 153° by alternate angle theorem.
What are parallel lines?
Parallel lines are those lines that are equidistant from each other and never meet.
Parallel lines cut by a transversal, forms different angle relationship like alternate angles, corresponding angles, etc.
Line a and m are parallel lines . Therefore, angles 1, 2, 3, 4, 5, 153 degrees are related base on alternate and corresponding relationship.
Hence,
∠3 = 153°(alternate angles)
Alternate angles are congruent.
learn more on parallel lines here: brainly.com/question/7849620
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