Geometry · Transformations
Rigid Motion
HSG-CO.A.2
Definition
A transformation (slide, flip, or turn) that preserves size and shape, producing a congruent image.
Examples
- Translations, reflections, and rotations are all rigid motions.
- A rigid motion never changes a figure's distances or angles.
Key rule
Rigid motions always preserve distance and angle, so the image is congruent to the original.
Memory hook
Slide, flip, or turn — size and shape never change.