####
MA19.8.22
Verify experimentally the properties of rigid motions (rotations, reflections, and translations): lines are taken to lines, and line segments are taken to line segments of the same length; angles are taken to angles of the same measure; and parallel lines are taken to parallel lines.

Verify experimentally the properties of rigid motions (rotations, reflections, and translations): lines are taken to lines, and line segments are taken to line segments of the same length; angles are taken to angles of the same measure; and parallel lines are taken to parallel lines.

### Unpacked Content

## UP:MA19.8.22

### Vocabulary

- Congruent
- Rotation
- Reflection
- Translation

### Knowledge

- How to measure line segments and angles.
- That similar figures have congruent angles.
- The definition/concept of what a figure does when it undergoes a rotation, reflection, and translation.
- How to perform a translation, reflection, and rotation.

### Skills

- verify by measuring and comparing lengths of a figure and its image that after a figure has been translated, reflected, or rotated its corresponding lines and line segments remain the same length.

### Understanding

- congruent figures have the same shape and size.
- Two figures in the plane are said to be congruent if there is a sequence of rigid motions that takes one figure onto the other.