22.
To find the scale factor and ratio of the perimeter:
From the figure,
The scale factor is, the dimension of the new figure is divided by the dimension of the original figure.
So, we get
[tex]\begin{gathered} \frac{6}{9}=\frac{8}{12}=\frac{10}{15} \\ \frac{2}{3}=\frac{2}{3}=\frac{2}{3} \end{gathered}[/tex]
Hence, the scale factor is,
[tex]\frac{2}{3}[/tex]
Next, to find the ratio of the perimeter.
So, we have
[tex]\begin{gathered} (9+12+15)\colon(6+8+10) \\ 36\colon24 \\ 3\colon2 \end{gathered}[/tex]
Hence, the ratio of the perimeter is 3:2.
