Given the following general rule for the scale factor:
[tex]\begin{gathered} Scale\text{ Factor:} \\ SF=\frac{\text{larger length}}{smaller\text{ length}} \end{gathered}[/tex]
So, we can take both bases of the triangles to get the following:
[tex]SF=\frac{20}{16}=\frac{5}{4}[/tex]
therefore, the scale factor is 5/4
