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c^2 = a^2 + b^2 - 2ab cos(C)
c^2 = 5^2 + 8^2 - 2(5)(8) cos(60)
c^2 = 25 + 64 - 80 (1/2)
c^2 = 89 - 40
c^2 = 49
c = 7
a = sisi didepan sudut A,
b = sisi didepan sudut B, dan
c = sisi didepan sudut C.
a = 5 cm
b = 8 cm
sudut C = 60°
Sehingga :
sisi c = 7 cm