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a = 3 cm
b = 4 cm
α = 45
ditanyakan:
R = ?
jawab :
R² = F1² + F2² + 2F1 F2 cos 45
R² = 3² + 4 ² + 2 (3)(4) 0,7
R² = 9 + 16 + 16,97
R² = 8,03
R = 2,83 cm