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F1 = 20 N
F1x = F1 sin 30 = 20 x 1/2 = 10 N
F1y = F1 cos 30 = 20 x 1/2 √3 = 10√3 N
F2 = 24 N
F2x = F2 cos 60 = 24 x 1/2 = 12 N
F2y = F2 sin 60 = 24 x 1/2 √3 = 12√3 N
F3x = 25 N
∑Fx = F3x - F1x - F2x = 25 - 10 - 12 = 3 N
∑Fy = F1y - F2y = 10√3 - 12√3 = 2√3
R = √(∑Fx² + ∑Fy²)