Work Step by Step
Consider $p$ be the measure of the angle with equal measure for two angles. Thus, $120 ^\circ +p+p=180 ^\circ$ $120 ^\circ +2p=180 ^\circ$ $2p=180 ^\circ-120 ^\circ$ $2p=60^\circ$ $p=30 ^\circ$
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