Given that the three internal angles of △ ABC satisfy the relation ∠ B + ∠ C = 2 ∠ a, then ∠ a = (). A.30 ° b.45 ° c.60 ° d.90 °

Given that the three internal angles of △ ABC satisfy the relation ∠ B + ∠ C = 2 ∠ a, then ∠ a = (). A.30 ° b.45 ° c.60 ° d.90 °

If the internal angle satisfies the relation ∠ B + ∠ C = 2 ∠ a, then ∠ a = (). A.30 ° b.45 ° c.60 ° d.90 °
Satisfy ∠ a = 180 ÷ 3 = 60
Choose C
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