# Contents

1. Section A: Side Lengths, Angles, and Lines of Symmetry
1. Warm-up: Which One Doesn’t Belong: Geometric Figures
2. 1.1: Card Sort: Shapes
3. 1.2: Guess the Category
1. Warm-up: Number Talk: Sums and Products
2. 2.1: Triangle Hunt
3. 2.2: The Right Kind of Triangle
1. Warm-up: How Many Do You See: Brick Pattern
4. 3.3: Guess Again
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
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?
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
2. Section B: Reason about Attributes to Solve Problems
1. Warm-up: Number Talk: Multiple Thirds
2. 7.1: All the Way Around
3. 7.2: Ponder Perimeter
4. 7.3: Perimeter Expressions
1. Warm-up: True or False: Equations with Fractions
2. 8.1: Unknown Lengths
3. 8.2: Lin’s Design
4. Section B Summary
1. Warm-up: Which One Doesn’t Belong: Figures
2. 9.1: Before and After
3. 9.2: Before and After, Perimeter Edition
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
3. Glossary