Definition of Reflection and Basic Properties

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Objectives

Students know the definition of reflection and perform reflections across a line using a transparency.
Students show that reflections share some of the same fundamental properties with translations (e.g., lines map to lines, angle and distance preserving motion, etc.). Students know that reflections map parallel lines to parallel lines.
Students know that for the reflection across a line L, then every point P, not on L, L is the b isector of the segment joining P to its reflected image P′.

Prior Knowledge

LinesParallel
Geometry2-D Shapes
GeometryAngles

45 mins Overhead projector transparencies (1 / student), Fine point dry - erase markers (1 / student), Felt cloth or other eraser (1 / or pair) 8.G.A.1

EngagyNY Curriculum by engageny, used under CC-BY-SA 3.0