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R² = F1² + F2² + 2.F1.F2. cos α
10² = 10² + 10² + 2. 10. 10. cos α
100 = 200 + 200.cos α
- 100 = 200. cos α
cos α = - 100 / 200
cos α = -1/2
arcCos -1/2 = 120°
jawaban D. Kedua vektor membentuk sudut 120°