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Calculating angle from two co-ordinates

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First off, an angle is something you have between two directions, not between two points.

However, I assume that you want the angle between the direction of the x-axis and the direction between the points. This is easy, if you program in c/c++ or similiar there is a function called atan2() which takes the difference in y as its first parameter and the difference in x as its second. It returns the angle in radians (between -pi and pi) (1 radian=180/pi degrees).

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