Engineering Mechanics Equilibrium and Friction Equilibrium

If two forces act at a right angle (90°), what will be the magnitude of their resultant force?

1
\(R = \sqrt{F_1^2 + F_ 2^2}\)
2
\(R = F_1 - F_2\)
3
\(R = 2F_1F_2\cos\theta\)
4
\(R = F_1 + F_2\)

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