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How to find the reference angle of an angle larger than 2PI

👉 Learn how to find the reference angle of a given angle. The reference angle is the acute angle formed by the terminal side ...
Ars Technica

Find the angles to a point on a sphere?

View image: http://sdw.webhop.net/tmp/problem.jpg <BR><BR>I want to step through the 2D coordinates (x,y) in the above picture. Say for example that x=0...1 and y=0 ...