Grade 8 Mathematics Module 2, Topic A, Lesson 4

Girl at Desk

Student Outcomes

  • 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 bisector of the segment joining P to its reflected image P'.

Downloadable Resources

Common Core Learning Standards

CCLS State Standard
8.G.1.a Lines are taken to lines, and line segments to line segments of the same length.
8.G.1.b Angles are taken to angles of the same measure.
8.G.1.c Parallel lines are taken to parallel lines.

Curriculum Map