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By the information given, we imply that this is a scalene.
Also we know that the addition of the interior angles in a triangle = 180°.
angle V + angle U + angle W = 180°
71° + angle U + angle W = 180° but U = W,
So, 71° + 2U = 180°
2U = 180 - 71
2U = 109°
U = 109/2
U = 54.5°
Conclusion angle U = 54.5°
