Respuesta :

Answer:

∠ 4 = 130°

Step-by-step explanation:

∠ 3 and ∠ 4 are adjacent angles and supplementary, thus

∠ 3 + ∠ 4 = 180°, that is

50° + ∠ 4 = 180° ( subtract 50° from both sides )

∠ 4 = 130°

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