Angle of Vector (Using X component and Y component)

θ = arctan (\frac{A_{y}}{A_{x}})

$theta = arctan( A_y / A_x )$

(A_{x}) X component

$(A_x) "X component"$

(A_{y}) Y component

$(A_y) "Y component"$

University Physics 12th Edition, Chapter 1, Equation #1.8