8th Grade · Geometry
Axis of Reflection
8.G.A.2
Definition
The line over which a figure is reflected, acting as a mirror. Each point and its image are equidistant from this line on opposite sides.
Teach it
Where it is taught, with guided notes, practice, homework, an exit ticket and an interactive Teacher Deck.
Examples
- Reflecting over the x-axis: (x,y) → (x,−y).
- Reflecting over the y-axis: (x,y) → (−x,y).
Key rule
Every point and its image are the same distance from the axis, on opposite sides.
Memory hook
The mirror line the figure flips across.