absolute value

 The distance of a number from zero; the positive value of a number. 

acute triangle
A triangle each of whose angles measures less than 90 degrees.

additive identity
The number zero is called the additive identity because the sum of zero and any number is that number.

additive inverse
The additive inverse of any number x is the number that gives zero when added to x. The additive inverse of 5 is -5.

adjacent angles
Two angles that share both a side and a vertex.

angle
The union of two rays with a common endpoint, called the vertex.

arc
A portion of the circumference of a circle.

area
The number of square units that covers a shape or figure.

associative property of addition
(a + b) + c = a + (b + c)

associative property of multiplication
(a x b) x c = a x (b x c)

average
A number that represents the characteristics of a data set.

axis of symmetry
A line that passes through a figure in such a way that the part of the figure on one side of the line is a mirror reflection of the part on the other side of the line.

base
The bottom of a plane figure or three-dimensional figure

Bisect
To divide into two congruent parts.

Box and whisker plot
A type of data plot that displays the quartiles and range of a data set.

Cartesian coordinates
A system in which points on a plane are identified by an ordered pair of numbers, representing the distances to two or three perpendicular axes.

circumference
The distance around a circle.

/coefficient
A constant that multiplies a variable.

combination
A selection in which order is not important.

common multiple
A multiple of two or more numbers.

commutative property of addition
a + b = b + a.

commutative property of multiplication
a*b = b*a.

complementary angles
Two angles whose sum is 90 degrees.

composite number
A natural number that is not prime.

cone
A three-dimensional figure with one vertex and a circular base.   

congruent
Figures or angles that have the same size and shape.

constant
A value that does not change.

coordinate plane
The plane determined by a horizontal number line, called the x-axis, and a vertical number line, called the y-axis, intersecting at a point called the origin. Each point in the coordinate plane can be specified by an ordered pair of numbers.

coplanar
Points that lie within the same plane.

counting principle
If a first event has n outcomes and a second event has m outcomes, then the first event followed by the second event has n times m outcomes.

cross product
A product found by multiplying the numerator of one fraction by the denominator of another fraction and the denominator of the first fraction by the numerator of the second.

cube
A solid figure with six square faces.

cylinder
A three-dimensional figure having two parallel bases that are congruent circles.

decimal number
The numbers in the base 10 number system, having one or more places to the right of a decimal point.

degree
A unit of measure of an angle.

 dependent events
in which the outcome of the second is influenced by the outcome of the first.

diagonal
The line segment connecting two nonadjacent vertices in a polygon.

diameter
The line segment joining two points on a circle and passing through the center of the circle.

digit
The ten symbols, 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. The number 215 has three digits: 2, 1, and 5.

distributive property
a(b + c) = ab + ac

dividend
In a / b = c, a is the dividend.

divisor 

In a / b = c, b is the divisor.

ellipse
The set of all points in a plane such that the sum of the distances to two fixed points is a constant.

equilateral triangle
A triangle that has three equal sides.

equivalent equations
Two equations whose solutions are the same.

equivalent fractions
Fractions that reduce to the same number.

error of measurement
The difference between an approximate measurement and the actual measure taken.

evaluate
To substitute number values into an expression.

even number
A natural number that is divisible by 2.

event
In probability, a set of outcomes.

exponent
A number that indicates the operation of repeated multiplication.

equivalent fractions
Fractions that reduce to the same number.

factor
One of two or more expressions that are multiplied together to get a product.

face
A flat surface of a three-dimensional figure.

formula
A equation that states a rule or a fact.

fraction
A number used to name a part of a group or a whole. The number below the bar is the denominator, and the number above the bar is the numerator.

frequency
The number of times a particular item appears in a data set.

frequency table
A data listing which also lists the frequencies of the data.

graph
A type of drawing used to represent data.

greatest common factor (GCF)
The largest number that divides two or more numbers evenly.

horizontal
A line with zero slope.

hypotenuse
The side opposite the right angle in a right triangle.

identity property of addition
The sum of any number and 0 is that number.

identity property of multiplication
The product of 1 and any number is that number.

improper fraction
A fraction with a numerator that is greater than the denominator.

independent events
Two events in which the outcome of the second is not affected by the outcome of the first.

inequality
A mathematical expression which shows that two quantities are not equal.

infinity
A limitless quantity.

inscribed angle
An angle placed inside a circle with its vertex on the circle and whose sides contain chords of the circle.

inscribed polygon
A polygon placed inside a circle so that each vertex of the polygon touches the circle.

integers
The set of numbers containing zero, the natural numbers, and all the negatives of the natural numbers.

intercept
The x-intercept of a line or curve is the point where it crosses the x-axis, and the y- intercept of a line or curve is the point where it crosses the y-axis.

intercepted arc
The arc of a circle within an inscribed angle.

interpolation
A method for estimating values that lie between two known values.

intersecting lines
Lines that have one and only one point in common.

inverse
Opposite. -5 is the additive inverse of 5, because their sum is zero. 1/3 is the multiplicative inverse of 3, because their product is 1.

irrational number
A number that cannot be expressed as the ratio of two integers.

isosceles triangle
A triangle with at least two equal sides.

least common denominator
The smallest multiple of the denominators of two or more fractions.

least common multiple
The smallest nonzero number that is a multiple of two or more numbers.

like fractions
Fractions that have the same denominator.

line
A straight set of points that extends into infinity in both directions.

line of symmetry
Line that divides a geometric figure into two congruent portions.

locus
A path of points.

logic
The study of sound reasoning.

lowest terms
Simplest form; when the GCF of the numerator and the denominator of a fraction is 1.

mean
In a data set, the sum of all the data points, divided by the number of data points; average.

median
The middle number in a data set when the data are put in order; a type of average.

midpoint
A point on a line segment that divides the segment into two congruent segments.

mixed number
A number written as a whole number and a fraction.

mode
A type of average; the number (or numbers) that occurs most frequently in a set of data.

multiplicative identity
The number 1 is the multiplicative identity because multiplying 1 times any number gives that number.

multiplicative inverse
The reciprocal of a number.

mutually exclusive events
Two or more events that cannot occur at the same time.

natural numbers
\The counting numbers.

negative number
A real number that is less than zero.

normal
Perpendicular.

number line
A line on which every point represents a real number.

obtuse angle
An angle whose measure is greater than 90 degrees.

obtuse triangle
A triangle with an obtuse angle.

octagon
A polygon with 8 sides.

odd number
A whole number that is not divisible by 2.

operation
Addition, subtraction, multiplication, and division are the basic arithmetic operations.

opposites
Two numbers that lie the same distance from 0 on the number line but in opposite directions.

ordered pair
Set of two numbers in which the order has an agreed-upon meaning, such as the Cartesian coordinates (x, y), where the first coordinate represents the horizontal position, and the second coordinate represents the vertical position.

origin
The point (0, 0) on a coordinate plane, where the x-axis and the y-axis intersect.

outcome
In probability, a possible result of an experiment.

parallel
Two lines are parallel if they are in the same plane and never intersect.

pentagon
A five-sided polygon.

percent
A fraction, or ratio, in which the denominator is assumed to be 100. The symbol % is used for percent.

perimeter
The sum of the lengths of the sides of a polygon.

permutation
A way to arrange things in which order is important.

perpendicular
Two lines are perpendicular if the angle between them is 90 degrees.

pi

The ratio of the circumference of a circle to its diameter

pi
A flat surface that stretches into infinity.

point
A location in a plane or in space, having no dimensions.

polygon
A closed plane figure made up of several line segments that are joined together.

polyhedron
A three-dimensional solid that is bounded by plane polygons.

polyhedron
A three-dimensional solid that is bounded by plane polygons.

positive number
A real number greater than zero.

power
A number that indicates the operation of repeated multiplication.

prime number
A number whose only factors are itself and 1.

probability
For an experiment, the total number of successful events divided by the total number of possible events.

product
The result of two numbers being multiplied together.

proper fraction
A fraction whose numerator is less than its denominator.

proportion
An equation of fractions in the form:
a/b = c/d

protractor
A device for measuring angles.

pyramid
A three-dimensional figure that has a polygon for its base and whose faces are triangles having a common vertex.

Pythagorean Theorem
The theorem that relates the three sides of a right triangle:

[image]

quadrant
One of the quarters of the plane of the Cartesian coordinate system

quadrilateral
A polygon with 4 sides.

quadrilateral
A polygon with 4 sides.

quotient
The answer to a division problem.

radius
The distance from the center to a point on a circle; the line segment from the center to a point on a circle.

range
In statistics, the difference between the largest and the smallest numbers in a data set.

rate
A ratio that compares different kinds of units.

ratio
A pair of numbers that compares different types of units.

rational number
A number that can be expressed as the ratio of two integers.

ray
part of a line, with one endpoint, and extending to infinity in one direction.

real numbers

The combined set of rational numbers and irrational numbers.

reciprocal
The number which, when multiplied times a particular fraction, gives a result of 1.

rectangle
A quadrilateral with four 90-degree angles.

reflection
A transformation resulting from a flip.

regular polygon
A polygon in which all the angles are equal and all of the sides are equal.

repeating decimal
A decimal in which the digits endlessly repeat a pattern.

rhombus
A parallelogram with four equal sides.

right angle
An angle whose measure is 90 degrees.

right triangle
A triangle that contains a right angle.

root
The root of an equation is the same as the solution to the equation.

rotation
A transformation in which a figure is rotated through a given angle, about a point.

sample space
For an experiment, the sample space includes all the possible outcomes.

Scale drawing
A drawing that is a reduction or enlargement of the original.

scalene triangle
A triangle with three unequal sides.

scattergram
A graph with points plotted on a coordinate plane.

scientific notation
A method for writing extremely large or small numbers compactly in which the number is shown as the product of two factors.

set
A well-defined group of objects.

similar
Two polygons are similar if their corresponding sides are proportional.

simplifying
Reducing to lowest terms.

skew lines
Lines that are not in the same plane and that do not intersect.

skew lines
Lines that are not in the same plane and that do not intersect.

slope
The steepness of a line expressed as a ratio, using any two points on the line.

solution
The value of a variable that makes an equation true.

sphere
A three-dimensional figure with all points in space a fixed distance from a given point, called the center.

square
A quadrilateral with four equal sides and four 90 degree angles.

square root
The square root of x is the number that, when multiplied by itself, gives the number, x.

statistics
The science of collecting, organizing, and analyzing data.

stem and leaf plot
A technique for organizing data for comparison.

supplementary angles
Two angles are supplementary if their sum is 180 degrees.

terminating decimal
A fraction whose decimal representation contains a finite number of digits.

translation
A transformation, or change in position, resulting from a slide with no turn.

transformation
A change in the position, shape, or size of a geometric figure.

transversal
A line that intersects two other lines.

trapezoid
A quadrilateral that has exactly two sides parallel.

tree diagram
A diagram that shows outcomes of an experiment.

triangle
A three-sided polygon.

unit price
Price per unit of measure.

variable
A letter used to represent a number value in an expression or an equation.

vertex
The point on an angle where the two sides intersect.

vertical angles
A pair of opposite angles that is formed by intersecting lines.

volume
A measurement of space, or capacity.

whole numbers
The set of numbers that includes zero and all of the natural numbers.

x-axis
The horizontal axis in a Cartesian coordinate plane.

x-intercept
The value of x at the point where a line or curve crosses the x-axis.

y-axis
The vertical axis in a Cartesian coordinate system.

y-intercept
The value of y at the point where a curve crosses the y-axis.

zero
The additive identity; the number that, when added to another number n, gives n.

zero property of multiplication
The product of zero and any number is zero.