Contents

1. Section A: Side Lengths, Angles, and Lines of Symmetry
2. Lesson 1: Ways to Look at Figures
   1. Warm-up: Which One Doesn’t Belong: Geometric Figures
   2. 1.1: Card Sort: Shapes
   3. 1.2: Guess the Category
3. Lesson 2: Ways to Look at Triangles
   1. Warm-up: Number Talk: Sums and Products
   2. 2.1: Triangle Hunt
   3. 2.2: The Right Kind of Triangle
4. Lesson 3: Ways to Look at Quadrilaterals
   1. Warm-up: How Many Do You See: Brick Pattern
   2. 3.1: Quadrilateral Hunt
   3. 3.2: What’s True about These Quadrilaterals?
   4. 3.3: Guess Again
5. Lesson 4: Symmetry in Figures (Part 1)
   1. Warm-up: Notice and Wonder: Seeing Double
   2. 4.1: Perfect Matches
   3. 4.2: In Search of Symmetry
   4. 4.3: Just Keep Folding
6. Lesson 5: Symmetry in Figures (Part 2)
   1. Warm-up: Number Talk: Keeping Track
   2. 5.1: Half-drawn Figures
   3. 5.2: What’s the Whole Picture?
   4. 5.3: What Could the Whole Figure Be?
7. Lesson 6: All Kinds of Attributes
   1. Warm-up: How Many Do You See: Dot after Dot
   2. 6.1: You’re Gonna Draw It: It’s Symmetric
   3. 6.2: Hidden Shapes
   4. Section A Summary
   5. Section A Practice Problems
8. Section B: Reason about Attributes to Solve Problems
9. Lesson 7: Ways to Find Unknown Length (Part 1)
   1. Warm-up: Number Talk: Multiple Thirds
   2. 7.1: All the Way Around
   3. 7.2: Ponder Perimeter
   4. 7.3: Perimeter Expressions
10. Lesson 8: Ways to Find Unknown Length (Part 2)
    1. Warm-up: True or False: Equations with Fractions
    2. 8.1: Unknown Lengths
    3. 8.2: Lin’s Design
    4. Section B Summary
11. Lesson 9: Symmetry in Action
    1. Warm-up: Which One Doesn’t Belong: Figures
    2. 9.1: Before and After
    3. 9.2: Before and After, Perimeter Edition
12. Lesson 10: Ways to Find Angle Measurements
    1. Warm-up: How Many Do You See: Symmetry in a Star
    2. 10.1: Before and After, Angle Edition
    3. 10.2: Angular Fish
    4. Section B Practice Problems
13. Glossary
14. Attributions
    1. Image Attributions
15. Notes
16. Notes