8th Grade · Geometry
Reflection
8.G.A.2
Definition
A transformation that flips a figure over a line of reflection, producing a mirror image. Each point and its image are equidistant from the line.
Teach it
Where it is taught, with guided notes, practice, homework, an exit ticket and an interactive Teacher Deck.
Examples
- (x, y) → (−x, y) when reflecting over the y-axis.
- The image is congruent but reversed.
Key rule
Each point and its image are the same distance from the line, on opposite sides.
Memory hook
A flip over a line, like a mirror.