По рисунку определить будут ли прямые параллельны, если: а) ∠ 2 = 125°, ∠ 7 = 125°

б) ∠ 5 = 115°, ∠ 2 = 65°

в) ∠ 1 = 65°, ∠8 = 65°

г) ∠ 6 = 120°, ∠3 = 60°

Ответ обоснуйте.
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