Glide Reflection Symmetry

Remember the A and the B we looked at when we learned about reflection symmetry.
We learned that we can make one half by reflecting the other half in a mirror.

This time, instead of just reflecting half of the image, we reflect it and slide it.

Pictures like this are said to have glide reflection symmetry. The line that splits the image is called the line of glide reflection. Draw the line of glide reflection for each of these pictures: