looks like a crotch
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It's a 50 degree angle. It's an angle that measures 50 degrees. It's the complementary angle of a 40 degree angle.
90 degrees
Unless you are ready for some complicated trigonometry, I would suggest that you use a protractor and draw a 50 degree angle BEYOND a right angle.
We assume A is the angle between the boards where they meet.A = (180 - 50 - 50) = 80 degrees.
It is 40 degrees