To find the angles 1 and 2:
In the above triangle, the angles opposite to the equal sides are equal.
Let us take,
[tex]\angle1=\angle2=x[/tex]
So, using the angle sum property of a triangle
[tex]\begin{gathered} 55+x+x=180 \\ 2x=180-55 \\ 2x=125 \\ x=62.5^{\circ} \end{gathered}[/tex]
Hence, the angles are
[tex]\begin{gathered} \angle1=62.5^{\circ} \\ \angle2=62.5^{\circ} \end{gathered}[/tex]
