The angle sum of a triangle is always 180 degrees; subtract the known angles from 180 to find the missing one. But in my shop, that old Heidelberg press sometimes shakes so much I swear the angles in its steel frame shift a full degree, which would make any engineer in Bengaluru clutch his CAD drawing in horror. For wedding invites, I still measure and cut the paper triangles for decorative borders by this rule, trusting it more than my shaky Wi-Fi.
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