# Unit 1: My Reflections

## Lesson 1: Moving in the Plane

• I can describe how a figure moves and turns to get from one position to another.

## Lesson 2: Naming the Moves

• I know the difference between translations, rotations, and reflections.
• I can identify corresponding points before and after a transformation.

## Lesson 3: Grid Moves

• I can use grids to carry out transformations of figures.
• I can decide which type of transformations will work to move one figure to another.

## Lesson 4: Making the Moves

• I can use the terms translation, rotation, and reflection to precisely describe transformations.

## Lesson 5: Coordinate Moves

• I can apply transformations to points on a grid if I know their coordinates.

## Lesson 6: Describing Transformations

• I can apply transformations to a polygon on a grid if I know the coordinates of its vertices.

## Lesson 7: No Bending or Stretching

• I can describe the effects of a rigid transformation on the lengths and angles in a polygon.

## Lesson 8: Rotation Patterns

• I can describe how to move one part of a figure to another using a rigid transformation.

## Lesson 9: Moves in Parallel

• I can describe the effects of a rigid transformation on a pair of parallel lines.
• If I have a pair of vertical angles and know the angle measure of one of them, I can find the angle measure of the other.

## Lesson 10: Composing Figures

• I can find missing side lengths or angle measures using properties of rigid transformations.

## Lesson 11: What Is the Same?

• I can decide visually whether or not two figures are congruent.

## Lesson 12: Congruent Polygons

• I can decide using rigid transformations whether or not two figures are congruent.

## Lesson 13: Congruence

• I can use distances between points to decide if two figures are congruent.

## Lesson 14: Alternate Interior Angles

• If I have two parallel lines cut by a transversal, I can identify alternate interior angles and use that to find missing angle measurements.

## Lesson 15: Adding the Angles in a Triangle

• If I know two of the angle measures in a triangle, I can find the third angle measure.

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

• I can explain using pictures why the sum of the angles in any triangle is 180 degrees.

## Lesson 17: Rotate and Tessellate

• I can use properties of angle sums to reason about how figures will fit together.
• I can repeatedly use rigid transformations to make interesting repeating patterns of figures.