c 2 = a 2 + b 2 − 2 a b cos C
x 2 = 10 2 + 6 2 − 2 ( 10 ) ( 6 ) cos 120°
x 2 = 100 + 36 − 120 − 1 2
x 2 = 100 + 36 + 60
x 2 = 196
x = 14
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c 2 = a 2 + b 2 − 2 a b cos C
x 2 = 10 2 + 6 2 − 2 ( 10 ) ( 6 ) cos 120°
x 2 = 100 + 36 − 120 − 1 2
x 2 = 100 + 36 − 120 − 1 2
x 2 = 100 + 36 + 60
x 2 = 196
x = 14
c 2 = a 2 + b 2 − 2 a b cos C
x 2 = 10 2 + 6 2 − 2 ( 10 ) ( 6 ) cos 120°
x 2 = 100 + 36 − 120 − 1 2
x 2 = 100 + 36 − 120 − 1 2
x 2 = 100 + 36 + 60
x 2 = 196
x = 14