Use Geogebra to
- create similar polygons,
- compare the scale factor of a dilation with the side lengths of the image and preimage
- compare the scale factor with the ratio of the perimeters
- compare the scale factor with the ratio of the areas
A written version of the investigation is below.
To see a modified version of this exploration (with check boxes to show/hide the ratios) see https://www.geogebra.org/m/ymm4V3XS