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Mapel : MatematikaKelas : X SMA
Bab : Trigonometri
Pembahasan :
Aturan Cosinus
Cos B = (AB² + BC² - AC²)/2AB.BC
Cos B = (5² + 3² - 7²)/2(5)(3)
Cos B = (25 + 9 - 49)/30
Cos B = -15/30
Cos B = -1/2
Cos B = Cos 120°
B = 120°
Sin < ABC = Sin 120°
Sin < ABC = 1/2 √3
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