Question

find the measure of the missing angle.

Explanation:

Step1: Recall angle - sum property

The sum of adjacent angles on a straight - line is 180°.

Step2: Set up the equation

Let the missing angle be \(a\). We have \(a + 141^{\circ}=180^{\circ}\).

Step3: Solve for \(a\)

\(a=180^{\circ}- 141^{\circ}\)
\(a = 39^{\circ}\)

Answer:

\(39^{\circ}\)