∠DEF = 180° − ∠D − ∠F = 180 − 48 − 64 = 68°
∠BEA = 180° − ∠DEF = 180 − 68 = 112°
∠A = 180° − ∠ABE − ∠BEA = 180 − 15 − 112 = 53°
Ответ: 53°
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∠DEF = 180° − ∠D − ∠F = 180 − 48 − 64 = 68°
∠BEA = 180° − ∠DEF = 180 − 68 = 112°
∠A = 180° − ∠ABE − ∠BEA = 180 − 15 − 112 = 53°
Ответ: 53°