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Verified answer
Mapel : MatematikaKelas : X SMA
Bab : Luas segitiga
Pembahasan :
Aturan Cosinus
AC² = AB² + BC² - 2AB.BC Cos B
10² = 9² + BC² - 2(9)BC cos 60°
100 = 81 + BC² - 9BC
BC² - 9BC - 19 = 0
BC = 10 cm
Luas Segitiga = 1/2 . AB . BC sin B
Luas segitiga = 1/2 . 9 . 10 . Sin 60°
Luas segitiga = 45 (1/2 √3)
Luas Segitiga = 45/2 √3 cm²