8th Grade · Geometry
Rotation
8.G.A.3
Definition
A transformation that turns a figure about a fixed center point by a specified angle and direction. The image is congruent to the original.
Teach it
Where it is taught, with guided notes, practice, homework, an exit ticket and an interactive Teacher Deck.
Examples
- 90° CCW about the origin: (x,y) → (−y,x).
- Size and shape stay the same — only the orientation changes.
Key rule
A rotation is a rigid motion — the image stays congruent to the original.
Memory hook
A turn around a fixed center point.