It is called a straight angle.
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Given an angle A whose measure is in the range [0, 180] degrees, the supplementary angle to A is the angle B such that the measure of A + B = 180 degrees.
This is a straight angle.
180 degrees.
A supplement of an angle is the angle that we add to the initial angle and have a result of 180 degrees. The supplement of 31 degrees is 180-31=149 degrees.
To find the measure of the third angle of a triangle, you can use the fact that the sum of all three angles in a triangle is always 180 degrees. So, if one angle measures 50 degrees and the other measures 85 degrees, you can subtract their sum from 180 to find the measure of the third angle. Therefore, the third angle would measure 180 - 50 - 85 = 45 degrees.