8.1 Unit Overview

Students investigate translations, reflections, and rotations, and use these transformations to make informal arguments about congruence. They also explore angle relationships on parallel lines and the triangle sum theorem.

By Amplify Classroom

Grades: 8th Grade

Subject: Math

Learning goals: Sub-Unit 1: Rigid Transformations (Lessons 1–6 + Practice Day + Quiz) • Perform translations, reflections, and rotations on and off a grid. • Describe translations, reflections, and rotations. Sub-Unit 2: Congruence (Lessons 7–9) • Determine whether two figures are congruent using rigid transformations. • Justify whether two figures are congruent using language such as rigid transformations, translation, reflection, rotation, pre-image, and image. • Describe the characteristics of congruent figures using vocabulary from this unit. Sub-Unit 3: Angle Relationships (Lessons 10–13 + Practice Day) • Use rigid transformations to discover new angle relationships and determine angle measures. • Analyze the effects of rigid transformations on lines and angles.