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a^2 = b^2 + c^2 - 2bc cos A
a^2 = 9^2 + 6^2 - 2.9.6 cos 120
a^2 = 81 + 36 - 108 . (-0,5)
a^2 = 117 + 54
a^2 = 171
a^2 = akar 171
a = 13,07 cm
jdi panjang sisi bc adalah 13,07 cm