Ответ:
- ∢1 = 149°;
- ∢2 = 31°;
- ∢3 = 31°;
- ∢4 = 149°;
- ∢5 = 25°;
- ∢6 = 155°;
- ∢7 = 155°;
- ∢8 = 25°.
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∢1 и ∢2, ∢2 и ∢4, ∢3 и ∢4, ∢1 и ∢3, ∢5 и ∢6, ∢6 и ∢8, ∢7 и ∢8, ∢5 и ∢7, — смежные — сумма смежных углов равна 180°.
∢1 и ∢4, ∢2 и ∢3, ∢5 и ∢8, ∢6 и ∢7 — вертикальные — равны между собой.