# Which of the following is not a rigid motion transformation?

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## Question:

Which of the following is not a rigid motion transformation?

A. Translation B. Stretch C. Rotation D. Reflection

B. Stretch

Step-by-step explanation:

A rigid motion, also called an isometry, is a transformation that maintains congruence.  This means all of the image angles will be congruent to the corresponding pre-image angles, and all of the image sides will be congruent to the pre-image sides.

In a translation, the figure is slid.  This does not change angle measure or side length; this is a rigid motion.

In a rotation, the figure is turned.  This does not change angle measure or side length; this is a rigid motion.

In a reflection, a mirror image of the figure is created.  This does not change angle measure or side length; this is a rigid motion.

In a stretch, a figure is enlarged by a scale factor.  This changes side length; this is not a rigid motion.

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