Reflection (axial symmetry)

Overview

Drag the mirror line and figure to see corresponding points.

Explanation

Reflection: flipping across the axis maps a figure onto its image.
Segments joining corresponding points are perpendicularly bisected by the axis; distances to the axis match.
Points on the axis are fixed.

How to use

Drag triangle vertices or the axis angle; dashed segments join corresponding points.

Knowledge points

• Symmetry
• Transformations