Answer:
60 degrees
Explanation:
Given three adjacent and congruent angles that form a line as illustrated in the diagram below:
Let each of the angles = x
The sum of angles on a line = 180 degrees.
Therefore:
[tex]\begin{gathered} x+x+x=180 \\ \implies3x=180 \\ \implies x=\frac{180}{3} \\ x=60\degree \end{gathered}[/tex]
Each of the angles measures 60 degrees.
