Ответ:
в) ∠С = 180°-α-2α = 180°-3α
г) ∠С = 180°-(60°+α)-(60°-α) = 180°-60°-α-60°+α = 60°
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Ответ:
в) ∠С = 180°-α-2α = 180°-3α
г) ∠С = 180°-(60°+α)-(60°-α) = 180°-60°-α-60°+α = 60°