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BC² = √AB² + AC² - 2 • AB • AC • cos A
BC² = √4² + 6² - 2 •4 • 6 cos 60⁰
BC² = √16 + 36 - 48 • ½
BC² = √52 - 24
BC² = √28
BC = 2√7 cm
Jadi, panjang BC adalah 2√7 cm