1.) В ∆ ABC AB = 2,2 см , BC = 4 см , CA = 2,5 см , Найти периметр.
2.) ∆ CDE = ∆ C1, D1, E1. DE = 15 м , ≤ C = 20° .
Найти ≤ C1, D1, E1.​
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