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A = 10
B = 4
S^2 = A^2 + B^2 - 2.A.B.cos 60
S^2 = 10^2 + 4^2 - 2.10.4.0,5
S^2 = 100 + 16 - 40
S^2 = 76
S = √76
S = √4.19
S = 2√19 atau 8,717