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12
90 degrees
Well, .125 is 1/8 of an inch. If the tape measure is marked in sixteenths, 1/8 would be the 2nd line from the beginning of an inch. Then estimate or eyeball 1/4 of the way to the next line and that is rougly .15 on a tape measure. This is how I would figure this out. If someone knows a better way, please share.
Assuming the third angle is x... 180 = 15 +85 + x 180 = 100 +x 80 = x The third angle is 80 degrees
cot(x) = 15/12 X = cot -1(15/12) In degree mode. X = 46o ======