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F1 = F2 = R
α = ?
R^2 = F1^2 + F2^2 + 2.F1.F2.cosα
F^2 = F^2 + F^2 + (2.F^2.cos α)
F^2 = 2 F^2 + (2.F^2.cos α )
cos α = (F^2 - 2F^2) / 2.F^2
cos α = - F^2 / 2F^2
cos α = -1/2
α = 120⁰
maka sudut apinya adalah 120 ⁰
semoga membantu ^_^