EXPLANATION:
Given;
We are given two triangles labeled MRS and NSR.
Required;
We are required touse the information provided rto rove tside SM is equal to side RN.
Solution;
[tex]RM=SN---Given[/tex][tex]RS=SR---Reflexive\text{ }property[/tex][tex]\angle MRS=\angle NSR---Congruent\text{ }angles[/tex][tex]\begin{gathered} \Delta MRS\cong\Delta NSR---SAS \\ \end{gathered}[/tex]
If two sides and the included angle of one triangle are congruent to the corresponding parts of a second triangle, then we can conclude that both triangles are congruent.
Therefore;
[tex]SM=RN[/tex]