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F1 = 7 satuan
F2 = 7 satuan
α = 60
dit : R ?
dijawab :
R = √(F1²+F2² +2F1F2x cosα)
= √(7²+7² + 2x7x7 x cos 60)
= √(98 + 2 x7x7x1/2)
= √147 satuan
= 12,12 satuan