"Jan Filip Tristan" <[EMAIL PROTECTED]> asked: > Think of a triangle with a=3 b=4 and c=5 and one angle 90 > degrees. Now I want to calculate the two other angels. > With this angels you can rotate the Image. My question is: How to > calculate them, do I need arccos.
Arccosine isn't necessary; arctangent is probably the best function to use. For example: >>> import math >>> math.degrees(math.atan2(3,4)) 36.86989764584402 which tells you that one of your angles is about 37 degrees. This is pretty well documented in the Python docs: http://docs.python.org/lib/module-math.html And if you need to review your trigonometry, Wikipedia is, of course, a reference: http://en.wikipedia.org/wiki/Trigonometric_function -Dave LeCompte
