Question

transformations test (topic 4)
which of the following is not a rigid motion?
○ translations
○ rotations
○ dilations
○ reflections

Explanation:

Rigid motions (also called isometries) are transformations that preserve the shape and size (distance and angle measures) of a figure. Translations, rotations, and reflections all preserve the length of sides and the measure of angles, so they are rigid motions. Dilations, however, change the size of the figure (they scale it by a factor), so they do not preserve the original size and are not rigid motions.

Answer:

C. dilations