In order to select corresponding sides, we look at the figure to the side the ones that have the same amount of line.
In this case,
[tex]\begin{gathered} SO=OP \\ LO=OX \\ XS=PL \end{gathered}[/tex]
Then, for the angles, we look for the vertex that are corresponding to each other.
[tex]\begin{gathered} X=L \\ O=O \\ P=S \end{gathered}[/tex]
This means that triangles are congruent
[tex]\Delta SOX=\Delta\text{POL}[/tex]
