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F1 = 8 cm
F2 = 12 cm
α = 60
S = ?
S^2 = F1^2 + F2^2 - 2.F1.F2.cos 60
S^2 = 8^2 + 12^2 - 2.8.12.0,5
S^2 = 64 + 144 - 96
S^2 = 112
S = √112
S = √16.7
S = 4√7 m
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