BC² = 3² + 6² -2(3)(6) cos 60
BC² = 9 + 36 -2(3)(6) ½
BC² = 9 + 36 - 18
BC² = 27
BC = √27
BC = 3√3 cm
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BC² = 3² + 6² -2(3)(6) cos 60
BC² = 9 + 36 -2(3)(6) ½
BC² = 9 + 36 - 18
BC² = 27
BC = √27
BC = 3√3 cm