21 and 24 are supplementary and m || n 23 and 24 are supplementary m21 + m24 = 180° m23+ m24 = 180° mz1+m24 = m23 + m24 m21 = m23 21 23 21 and 23 are alternate exterior angles fll a ? Definition of supplementary angles ? ? Definition of congruence Definition of alternate exterior angles ?

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