# Math Terminology: Definitions and Examples

Classified in Mathematics

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## Relatively Prime

When the greatest common factor of two numbers is 1

## Rational Number

Any number that can be expressed as a ratio of two integers

## Reciprocal

One of two numbers whose product is 1, also called multiplicative inverse

## Relation

A set of ordered pairs

## X Coordinate

The first number in an ordered pair; it tells the distance to move right or left from the origin (0,0)

## Y Coordinate

The second number in an ordered pair; it tells the distance to move up or down from the origin (0,0)

## X Axis

The horizontal axis on a coordinate plane

## Y Axis

The vertical axis on a coordinate plane

## Coordinate Plane

A plane formed by the intersection of a horizontal line (the x-axis) and a vertical line (the y-axis)

## Vertical Line Test

A method for seeing if a graph represents a function; if the graph is ever intersected by the line more than once, it is not a function

## Dependant Variable

The output of a function

## Continuous Graph

A graph made up of connected lines or curves

## Independent Variable

The input of a function

## Discrete Graph

A graph made up of unconnected points

One of the four regions that the coordinate plane is divided into by the x-and y-axes

## Range

The set of all possible output values for a function

## Function

An input-output relationship that has exactly one output for each input

## Domain

The set of all possible input values for a function

## Ordered Pair

A pair of numbers that can be used to locate a point on the coordinate plane

## Origin

The point where the x-axis and y-axis intersect on the coordinate plane

## Hypotenuse

In a right triangle, the side opposite the right angle

## Density Property

The property that states that between any two real numbers, there is always another real number

## Exponent

For a product, a number that is multiplied by itself to form the product

## Legs

In a right triangle, the sides that include the right angle

## Pythagorean Theorem

In a right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the legs

## Scientific Notation

A method of writing very large or very small numbers by using powers of 10

## Irrational Number

A number that cannot be expressed as a ratio of two integers or as a repeating or terminating decimal

## Real Number

A rational or irrational number

## Perfect Square

A square of a whole number

## Principal Square Root

The non-negative square root of a number

## Rate

A ratio that compares two quantities measured in different units

## Cross Product

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

## Center of Dilation

The point of intersection of lines from all the angles in a dilation

## Dilation

A transformation that enlarges or reduces a figure

## Corresponding Sides

Matching sides of two or more polygons

## Corresponding Angles

Angles in the same relative position in polygons with an equal number of sides

## Unit Rate

A rate in which the second quantity in the comparison is one unit

## 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