Answer: ∠1 = 57
Step-by-step explanation: ∠1 and ∠2 are the same measure since they are equiangular. Since ∠4 and ∠2 are supplementary, we can find out ∠2 by subtracting ∠4 from 180.
180 - 123 = ∠2
57 = ∠2
Since ∠2 = ∠1, ∠1 is 57 degrees.
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