Answer:
Because all consecutive angles in a parallelogram are supplementary, m∠SVU = 180 - 57 = 123°.
Step-by-step explanation:
In a parallelogram, sum of adjacent angles is 180
∠TSV + ∠SVU = 180
57 + ∠SVU = 180
∠SVU = 180 - 57
∠SVU = 123°
