Ответ учителя по предмету Геометрия
CD = DE => ∠C = ∠E = 60°
∠D = 180° — (∠C + ∠E) = 60°
∠C = ∠D = ∠E => CD = DE = CE = 40 см
ΔECH
CH = EC/2 = 20 см
CD = DE => ∠C = ∠E = 60°
∠D = 180° — (∠C + ∠E) = 60°
∠C = ∠D = ∠E => CD = DE = CE = 40 см
ΔECH
CH = EC/2 = 20 см
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