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12 √3 = 1/2 8.6 sin c
12√3 = 4.6 sin c
√3 = 2 sin c
sin c = √3/2 = 1/2 √3
c = 60°
c = √(a² + b² - 2ab cos c)
= √(8² + 6² - 2.8.6 cos 60°)
= √(64 + 36 - 96. 1/2)
= √(100 - 48)
= √52 cm