The value of the missing angle x will be equal to 31°.
<h3>What is the supplementary angle?</h3>
Supplementary angles are those that total 180 degrees. Angles 130° and 50°, for example, are supplementary angles because the sum of 130° and 50° equals 180°.
The angle is defined as the span between two intersecting lines or surfaces at or close to the point where they meet.
Given that the two angles of the triangle are 111 and 38. The value of the missing angle will be calculated as,
x + 111 + 38 = 180
x = 180 - 111 - 38
x = 31
Therefore, the value of the missing angle x will be equal to 31°.
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