According to the rule of similarity two triangles are similar if: the sides of the triangle have the same ratios:
So:
[tex]\begin{gathered} \frac{KM}{PR}=\frac{ML}{PQ}=\frac{KL}{RQ} \\ \frac{10}{12}=\frac{15}{18}=\frac{20}{24}=0.8333 \end{gathered}[/tex]
So triangle KLM and PQR are similar.
