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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