What are you using to measure the angle?
well i know the length of the beam in front of angle and i know the length of the oposit beam
so i can theoretectly draw a triangle and i'd know one of it's side (it's the difrence between the beams)
then i do tangate Alpha = the beam across devided by the base (tan in a calculator)
then shift-Tan-gates to know the alpha...
then it's the angle..
(really easy todo really hard to explain ...)
here i'll post a photo
who said 11th grade math wasn't helpfull in life ??