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I have a few of those. The two seems to curve up radically, with a much steeper bevel at the toe than the rest of the blade. It seems to work OK. I just don't like the way it looks.

I hone it...

The error in the answer is small because it's a small angle, but the formula is wrong.

You don't know the hypotenuse. You only know the opposite side (half the spine) and the adjacent side (the width of the blade). So, you're really dealing with a tangent.

This is not correct. The correct formula is:
angle = 2arctan (.5spine/blade)

Your formula is approximately correct because the bevel angle is so small. If the angle was larger, it would be...