ini gmn caranya?? bagaimanaaaaa

F1 = F2 = R = 5
[tex]r = \sqrt{ {f1}^{2} + {f2}^{2} + 2f1f2 \cos( \alpha ) } \\ {5}^{2} = {5}^{2} + {5}^{2} + 2 \times 5 \times 5 \cos( \alpha ) \\ 25 = 50 + 50 \cos( \alpha ) \\ - 25 = 50 \cos( \alpha ) \\ \cos( \alpha ) = - \frac{1}{2} \\ \alpha = 120[/tex]
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Maaf kalau salah