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sin α ≈ sin60° = √3/2 = 1,732 / 2 = 0,866
G / A = 15 / A = sin 60° = 0,866
A = 15 / sin 60° = 15 / (√3/2) = (15 × 2) / √3 = 30 / √3 = 30 / 1,732 = 17,32 cm