# Pre-Algebra Chapter 5

## 13 terms

### conversion factor

A fraction whose numerator and denominator represent the same quantity but use different units.

### cross product

The product of numbers diagonal from each other in a comparison of two ratios.

### dilation

a transformation that enlarges or reduces a figure.

### enlargement

An increase in size of all dimensions in the same proportions.

### ratio

A comparison of two quantities by division.

### rate

A ratio that compares two quantities measured in different units.

### reduction

A decrease in size of all dimensions.

### congruent angles

Angles that have the same measure.

### scale model

A proportional model of a three-dimensional object.

### unit price

A unit rate used to compare prices.

### scale factor

The ratio used to enlarge or reduce similar figures.

### similar figures

Figures with the same shape but not necessarily the same size.

### scale drawing

A drawing that uses a scale to make an object smaller than (a reduction) or larger than (an enlargement) the real object.