Philip P. answered • 09/19/14

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It's really just a cartesian to polar coordinate conversion. Let x = the x component of the vector and y = the y-component. The magnitude of the vector, r, is:

r = |(x

^{2}+ y^{2})^{1/2}|The vector's direction is:

θ = arctan(y/x)

http://www.wyzant.com/resources/files/280380/polar_and_rectangular_coordinates/download?encryptedID=wdH8Mj3%2BIjM%3D&d=v