Since the given lines are parallel, then by the alternate interior angle theorem, m/1 = 90°, m/1 +m/2=m25, and 23 24.
substitution
transitive property
definition of linear pair
Statement
90° +m/2+m/4 = 180° →
m/3= m/4
m/1+m/2+ m/3 = 180°
definition of straight angle
Congruent angles have equal measures.
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Reason
