North Carolina Standard Course of Study
Understand congruence and similarity using physical models, transparencies, or geometry software.
NC.8.G.2. Use transformations to define congruence.
NC.8.G.2.a. Verify experimentally the properties of rotations, reflections, and translations that create congruent figures.
NC.8.G.2.b. Understand that a two-dimensional figure is congruent to another if the second can be obtained from the first by a sequence of rotations, reflections, and translations.