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

MandeepMarch 22, 2018 at 6:12 pmThanks so much for sharing the video of this activity. I had this activity in my mind, but didn’t know how to create it in the Geogebra.

Stacie BenderMarch 25, 2018 at 7:49 pmYou’re welcome! My intent was to write up instructions for my students to follow so they could learn more about the power of Geogebra. However, we are not one-to-one and it’s difficult to get a cart of computers so I posted anyway hoping it might help fellow teachers.