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ANSWER ASAP 30 POINTS

ANSWER ASAP 30 POINTS-example-1
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m<1 and <2 are supplementary by the linear pair postulate
m<1 + m<2 = 180 by definition of supplementary . It's given m<2 ≡ m<3
so m<2 = m<3 by angle congruence postulate
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