Return to Unit List Grade 3 Unit 12: Geometry   2. and 3.Dimensional Figures Be an Architect   Crossword Puzzle   Identification Lesson 1: 3-Dimensional Figures Lesson 2: 2-Dimensional Figures Lesson 3: Lines, Line Segments, Rays, and Angles Lesson 4: Polygons Lesson 5: Triangles Lesson 6: Quadrilaterals Lesson 7: Problem Solving: Skill Use a Diagram   Geometry Window Decorations   Crossword Puzzle   Identification Lesson 1: Congruent and Similar Figures Lesson 2: Explore Translations, Reflections, and Rotations Lesson 3: Explore Symmetry Lesson 4: Problem Solving: Strategy Find a Pattern Lesson 5: Perimeter Lesson 6: Area Chapter 24 Writing for Math Lesson 7: Explore Volume What Are the Perimeter and the Area?