arcctn(2/1) = 26.56505118...°

arcctn(1/2) = 63.43494882...°

90° - 26.56505118...° = 63.43494882...°

90° - 63.43494882...° = 26.56505118...°

The "arcctn" function tells you how many degrees an angle will be if its cotangent is x/y. Remember that tangents, sines, cosines, & such are all ratios related to the sides & angles of a triangle. That's what * trigonometry* is all about!

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© Derek Cumberbatch