| A | B |
|---|
| similar figures | figures that have the same shape and may or may not have the same size |
| congruent figures | figures that have the same size and shape |
| symmetry | both parts of a figure match exactly when the figure is folded in half |
| line of symmetry | a line on which a figure can be folded so that both halves are congruent |
| triangle | a 3-sided closed plane figure |
| parallelogram | a quadrilateral with two sets of parallel lines |
| rhombus | a parallelogram that has four equal sides |
| trapezoid | a quadrilateral having one set of parallel lines |
| square | a special rectangle with four equal sides |
| rectangle | a parallelogram that has four right angles |
| plane figure | a 2-D figure that lies on a flat surface |
| polygon | a closed plane figure made up of line segments |
| quadrilateral | a 4-sided closed plane figure |
| pentagon | a 5-sided closed plane figure |
| hexagon | a 6-sided closed plane figure |
| octagon | an 8-sided closed plane figure |
