[sammysinger]

Hello Bill,
I am currently working with a group of 8th grade teachers on 8.C.1. We noticed in the progression document it states “They should encounter and experience transformations which do not preserve lengths, do not preserve angles, or do not preserve either.”
We are all stumped. When we are thinking of ‘transformations’ we are thinking of reflections, rotations, translations, and dilations. A dilation does not preserve length, but what is an example of a transformation that does not preserve angle measure OR either length or angles? Besides saying it is not a transformation, we are not sure how to show that it is a transformation yet does not preserve angle measure.

Any help in clarification would be much, much, much appreciated!
Sincerely,
Mindy Singer

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