We took a lab based on Symmetry and our proffesor told us to

We took a lab based on Symmetry, and our proffesor told us to find a repeating pattern around campus.

Please 1- draw a unit cell (must had 4 edges), 2- label symmetry element within each unit cell using standard notation, 3- indicate the plane group to which the pattern belongs.

This is the repeating pattern I took a picture of

This will help you in figuring out the answer, please use the graphic symmetry content as a refrence in figuring out what kind of symmetry the picture I took represent.

Solution

In your image, the cell will consist of a small rectangle atop a large rectangle with axis of both passing through the center of each. Hence pm

For a cell like this, there can be living one line of symmetry passing throughcenter of each vertically .