Relax

Respuesta :

Answer:120

Step-by-step explanation:

Answer:

B

Step-by-step explanation:

∠ 3 and 70° are vertical angles and congruent, thus ∠ 3 = 70°

∠ 1 = 90° - 70° = 20° ( right angle )

∠ 3 - ∠ 1 = 70° - 20° = 50° → B

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