Answer:
∠ U = 70°
Explanation:
the exterior angle of a triangle is equal to the sum of the 2 opposite interior angles.
∠ RVU is an exterior angle of the triangle , then
∠ U + 50° = 120° ( subtract 50° from both sides )
m<U=70
we know that the measure of the out side angle is equal to the measure of the 2 inside angles, so 120-50=70
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