Unit 1

Section A: Rigid Transformations

• Lesson 1: Moving in the Plane

  Let’s describe ways figures can move in the plane.

  • Lesson Activities
  • Practice Problems

• Lesson 2: Naming the Moves

  Let’s be more precise about describing moves of figures in the plane.

  • Lesson Activities
  • Practice Problems

• Lesson 3: Grid Moves

  Let’s transform some figures on grids.

  • Lesson Activities
  • Practice Problems

• Lesson 4: Making the Moves

  Let’s draw and describe translations, rotations, and reflections.

  • Lesson Activities
  • Practice Problems

• Lesson 5: Coordinate Moves

  Let’s transform some figures and see what happens to the coordinates of points.

  • Lesson Activities
  • Practice Problems

• Lesson 6: Describing Transformations

  Let’s transform some polygons in the coordinate plane.

  • Lesson Activities
  • Practice Problems

Section B: Properties of Rigid Transformations

• Lesson 7: No Bending or Stretching

  Let’s compare measurements before and after translations, rotations, and reflections.

  • Lesson Activities
  • Practice Problems

• Lesson 8: Rotation Patterns

  Let’s rotate figures in a plane.

  • Lesson Activities
  • Practice Problems

• Lesson 9: Moves in Parallel

  Let’s transform some lines.

  • Lesson Activities
  • Practice Problems

• Lesson 10: Composing Figures

  Let’s use reasoning about rigid transformations to find measurements without measuring.

  • Lesson Activities
  • Practice Problems

Section C: Congruence

• Lesson 11: What Is the Same?

  Let’s decide whether shapes are the same.

  • Lesson Activities
  • Practice Problems

• Lesson 12: Congruent Polygons

  Let’s decide if two figures are congruent.

  • Lesson Activities
  • Practice Problems

• Lesson 13: Congruence

  Let’s find ways to test congruence of interesting figures.

  • Lesson Activities
  • Practice Problems

Section D: Angles in a Triangle

• Lesson 14: Alternate Interior Angles

  Let’s explore why some angles are always equal.

  • Lesson Activities
  • Practice Problems

• Lesson 15: Adding the Angles in a Triangle

  Let’s explore angles in triangles.

  • Lesson Activities
  • Practice Problems

• Lesson 16: Parallel Lines and the Angles in a Triangle

  Let’s see why the angles in a triangle add to 180 degrees.

  • Lesson Activities
  • Practice Problems

Section E: Let’s Put It to Work

• Optional

  Lesson 17: Rotate and Tessellate

  Let’s make complex patterns using transformations.

  • Lesson Activities