Glide reflection-the combination of a reflection in a line and a translation among that line
Orientation-refers to the arrangement of points, relative to one another, after a transformation has occurred
Isometry-is a transformation of the plane that preserves length.
Direct isometry- both the length (the orientation) is the same.
Opposite isometry- changes the order
Invarianti- figure or property that remains unchanged under transformation of the plane is referred to as invariant no variations have occurred.
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