# 8.1 Rigid Transformations and Congruence

### Lesson 1

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

### Lesson 2

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

### Lesson 3

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

### Lesson 4

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

### Lesson 5

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

### Lesson 6

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

### Lesson 7

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

### Lesson 8

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

### Lesson 9

• 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

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

### Lesson 11

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

### Lesson 12

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

### Lesson 13

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

### Lesson 14

• 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

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

### Lesson 16

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

### Lesson 17

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