По рисунку определить будут ли прямые параллельны, если:

а) ∠ 2 = 1250, ∠ 7 = 1250

б) ∠ 5 = 1150, ∠ 2 = 650

в) ∠ 1 = 650, ∠8 = 650

г) ∠ 6 = 1200, ∠3 = 600

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