Answer:
D
Step-by-step explanation:
151 + 29 = 180
D. ∠3 and ∠4 are supplementary angles
Supplementary angles are two angles that add up to 180°
∠3=15° ∠4=29°
15° + 29° = 180°
So, ∠3 and ∠4 are suplementary angles.
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