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AB = c = 14cm
AC = b = 10cm
BC = a = 6cm
sudut C ????
Cos C = b² + a² - c²/2ab
Cos C= 100 + 36 - 196 /2(6)(10)
Cos C = -60/120°
Cos C = -1/2
C = 120°
Jawab:
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