To supplement the geometry in chapter 1 we are pulling a few lessons from chapters 10 and 11 to introduce reflections over a line of symmetry.
Notice how students created shapes that "flipped" or reflected over the line of symmetry. This is especially a good example to show how the image doesn't just slide over and copy, but flips or rotates over the line.
Geometry 3-5, Transformations - Reflections
to create an online version of this activity.