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## Main Question or Discussion Point

In the wiki, there is an explanation for what is the tangential angle in cartesian and polar coordinates. However, the orientation these angles aren't specified. In cartesian coordinates, I believe that the tangential angle φ is measured from the x-axis, in polar coordinates the tangential angle ψ is measured from radial axis?

https://en.wikipedia.org/wiki/Subtangent

https://en.wikipedia.org/wiki/Tangential_angle

https://en.wikipedia.org/wiki/Subtangent

https://en.wikipedia.org/wiki/Tangential_angle