Grade 8 Mathematics Module 2, Topic B, Overview

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Topic B is a critical foundation to the understanding of congruence.  All the lessons of Topic B demonstrate to students the ability to sequence various combinations of rigid motions while maintaining the basic properties of individual rigid motions.  Lesson 7 begins this work with a sequence of translations.  Students verify experimentally that a sequence of translations have the same properties as a single translation.  Lessons 8 and 9 demonstrate sequences of reflections and translations and sequences of rotations.  The concept of sequencing a combination of all three rigid motions is introduced in Lesson 10; this paves the way for the study of congruence in the next topic. 

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Common Core Learning Standards

CCLS State Standard
8.G.2 Understand that a two-dimensional figure is congruent to another if the second can be obtained from...

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