They are supplimentary angles.
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The sum of the measures of the angles in any triangle in the plane is 180 degrees. If two angles are 15 and 85 then their sum is 100 degrees and 180-100=80 degrees
Sum of adjacent angles on a straight line.
Supplementary angles have a sum of 180 degrees.
I assume you mean a TRIANGLE. The angles in a triangle will sum up to 180 degrees. So sum your two angles and subtract that from 180.
The sum of all the internal angles of a triangle is 180. If two of them are each 50, then the third one must be 180 - (2 x 50) = 180 - 100 = 80.