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The resultant force can be then formed by adding the resultants of x and y components using the

parallelogram law. Figure 2.17 below show the example of the process.

Figure 2.21

Generally, the x and y components of resultant of any number of coplanar forces can be

represented by the algebraic sum of x and y component of all forces.

FRx = Σ Fx

FRy = Σ Fy

Figure show the FR and direction θR, the magnitude FR can be obtained using the Pythagorean
Theorem.

= √ 2 + 2

The direction angle θ also can be found using trigonometry

= −1 [ ]

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