| A | B |
|---|
| congruent figures | Figures that have the same size and shape. |
| corresponding parts | Angles or sides that are images of each other under a transformation. |
| distance from a point to a line | The length of the perpendicular segment from the point to the line. |
| equidistant | The same distance. |
| line of symmetry | A figure in the plane has a line of symmetry if the figure can be reflected onto itself by a reflection in the line. |
| perpendicular bisector | A line that is perpendicular to a segment at its midpoint. |
| proof | A sequence of justified conclusions, leading from what is given or known to a final conclusion. |
| reflection | A transformation that creates a mirror image. The original figure is reflected in a line of reflection. |
