Things to Learn
- Understand the definition of reflection and perform reflections across a line using a transparency.
- Show that reflections share some of the same fundamental properties with translations (e.g., lines map to lines, angle- and distance-preserving motion).
- See that reflections map parallel lines to parallel lines.
- Explore that a line L is the bisector of the segment joining P to its reflected image P’ for the reflection across L and for every point P not on L.
Reflection of the plane about a line
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