Using the Inverse Tangent

Demonstrates how to use the inverse tangent function to find angles. Explains why it is sometimes--but not always--necessary to add 180 degrees (or pi radians) to the angle you get from the inverse tangent function on your calculator, and how to know when to do that.

[yuanzi]

Thank you, the best I saw on this topic

[anthonypace]

Thank you very much! Exactly what I needed.