**Slopes to find incidence angle**
I hope someone has a better solution for you, but I believe the 35 degree angle makes a slope of about 0.700208, and the 12.5 degree angle makes another slope of 0.221695 that is perpendicular to the first slope. The hypotenuse of those slopes is 0.734465, which seems to correspond to an angle of approximately 36.296 degrees, but that does not seem quite right maybe. There could be a mistake in my math. Here is my solution in JavaScript:
with(Math)atan2(sqrt(pow(sin(35*PI/180)/cos(35*PI/180),2)+pow(sin(12.5*PI/180)/cos(12.5*PI/180),2)),1)/PI*180
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Last edited by RonSpain; Jul 18th 2017 at 12:36 PM.
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