| Term | Definition |
| Ratio | A type of comparison of 2 #s or measures |
| Rate | A ratio that compares 2 quantities measured in different units. Rates describe how one measure depends on another measure. |
| Unit rate | A form of a rate that gives an amount per 1 unit |
| Proportion | An equation stating that 2 ratios are equivalent |
| Cross Products | Equal products formed from a pair of equivalent ratios by multiplying the numerator of each fraction by the denominator of the other fraction |
| Similar figures | Figures that have the same shape but not necessarily the same size |
| Congruent figures | Figures that have the same shape and the same size |