The direction of a two-dimensional resultant vector, i.e., the angle of the resultant vector with the positive x-axis, can be found by taking the inverse tangent of the slope of the resultant: θ = t a n − 1 ( y x ) when the x-component of the resultant is positive, or θ = t a n − 1 ( y x ) ± 180 ∘ when the x-component ...