| A | B |
|---|
| preimage | The original figure, before it has been transformed. |
| dilation | A non-rigid transformation in which the preimage and image of a figure are similar. |
| tessellation | A tiling of a plane with figures that leave no gaps or overlaps. |
| image | The new figure which has been transformed using a motion-rule on each point of the preimage. |
| map | A movement from the preimage to the image. |
| transformation | The operation that maps the preimage onto the image. |
| rigid | A transformation in which the preimage maps onto a congruent image. |
| isometry | A rigid transformation that preserves length, angle measures, parallel lines, and distances between points. |
| reflection | A rigid transformation that flips a figure over a given line. |
| line of symmetry | A figure in a plane has a ______ if the figure can be mapped onto itself by a reflection in the line. |
| rotation | A rigid transformation in which a figure is turned about a fixed point. |
| rotational symmetry | A figure in a plane has _____ if the figure can be mapped onto itself by a rotation of 180 degrees or less. |
| translation | A rigid transformation that slides a figure on a coordinate plane. The movement can be vertical, horizontal, or diagonal. |
