A glide reflection is a combination of a reflection in a line and a translation along that line. This can be done in either order. A rotational transformation is a rotation around a fixed point or axis.
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Because the glide reflection is a combination of two isometries, it is also an isometry.
A glide reflection is a combination of translation along some line and reflection in the line. Human footprints are a good example. Glide symmetry is another way to refer to it.
translation
A. Glide reflection b. Orientation of points c. Parallelism of lines d. Areas of polygons
Glide reflection