| A | B |
|---|
| Congruent Figures | Two figures are congruent if you can flip, turn, or slide one figure so that it fits exactly on the other. |
| Line Reflection | A transformation that matches each point on a figure with its mirror image over (i.e. flipped across) a line. |
| Reflectional Symmetry | A figure or design has reflectional symmetry if you can draw a line that divides the figure into halves that are mirror images. |
| Rotation | A transformation that turns a figure counterclockwise about a point. |
| Rotational Symmetry | A figure or design has rotational symmetry if it can be rotated less than one full turn about a point to a position in which it looks the same as the original. |
| Symmetry | An object or design has symmetry if part of it is repeated to create a balanced pattern. |
| Tessellation | A design made from copies of a basic design element that cover a surface without gaps or overlaps. |
| Transformation | A geometric operation that matches each point on a figure with an image point. |
| Translation | A transformation that slides each point on a figure to an image point a given distance and direction from the original point. |
| Translational Symmetry | A design has translational symmetry if it can be created by copying and sliding a basic shape in a regular pattern. |
