To find the scale factor we can use a ratio between the length of two segments, for exemple, the scale factor "k" will be
[tex]k=\frac{D^{\prime}E^{\prime}}{DE}[/tex]We can see in the graph that D'E' is 10, and DE is 5, therefore
[tex]\begin{gathered} k=\frac{10}{5} \\ \\ k=2 \end{gathered}[/tex]The scale factor is 2
