Given isosceles triangle
There are two congruent angles
let one of them = x
so,
The angles of the triangle = x , x and 122.6
The sum of the interior angles of the triangle = 180
So,
[tex]\begin{gathered} x+x+122.6=180 \\ 2x=180-122.6 \\ 2x=57.4 \\ x=\frac{57.4}{2} \\ \\ x=28.7 \end{gathered}[/tex]So, the measure of one of the two congruent angles = 28.7
