I think "isometries" and "rigid transformation" are two different names for the same thing. Look for "isometry" on wikipedia.
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The identity transformation.
Because the glide reflection is a combination of two isometries, it is also an isometry.
Rotations, reflections, and translations are all isometries while a dilation isn't because it doesn't preserve distance
Reflecting
These are transformations that do not change the shape or size, only its location (translation) or orientation (rotation).