Doug Tarnopol - GRE: A Strategic Approach with Online Diagnostic

Absolute value: The positive value of a nonzero number. Also, the distance of a number from zero on the number line.

Acute angle: An angle whose measure is less than 90.

Angle bisector of a triangle: A line segment that extends from a vertex to the opposite side and divides the vertex angle into two congruent smaller angles.

Apothem: A line segment from the center of a polygon that is perpendicular to a side.

Base: A number that is raised to an exponent (see exponent ).

Binomial: An algebraic expression that consists of two terms.

Box plot: A graphical way to display the main features of a data set, such as the median and the quartiles.

Central angle: An angle formed by two radii of a circle.

Chord: A line segment whose endpoints are points on a circle.

Circumference: Distance around a circle.

Complement of a set: The elements that are in the universal set but not in the given set.

Complementary angles: Two angles whose sum measures 90.

Composite number: A number that contains at least three factors.

Concentric circles: Two circles of different sizes with the same center.

Cone: A three-dimensional figure with a circular base and a vertex.

Congruent: Two or more angles (or sides) with the same measure.

Congruent figures: Two or more figures with the same size and same shape.

Consecutive integers: Integers whose difference is 1.

Constant: A quantity that can assume only one value.

Cube: A three-dimensional figure, shaped like a box, for which all edges are equal in length.

Cylinder: A three-dimensional figure whose bases are two congruent circles and whose side is a curved rectangle.

Denominator: The lower part of a fraction.

Diameter: A chord of a circle that contains the center.

Domain: The values of the independent variable of a function.

Element: A member of a set.

Empty set: A set with no elements.

Equilateral triangle: A triangle in which the angles are congruent and the sides are congruent.

Exponent: A number attached as a superscript to a base. If the exponent is a positive integer, then it shows the number of times that a base is multiplied by itself. For example, in the number 35, 3 is the base and 5 is the exponent. 35 means (3)(3)(3)(3)(3) = 243.

Even number: An integer that is divisible by 2.

Face: A plane surface of a geometric solid.

Factors of a number: Integers that divide into a given number with no remainder.

Function: A set of ordered pairs for which there is only one range value for each domain value.

Greatest common factor: The largest integer that can divide into a given group of integers.

Hexagon: A six-sided figure.

Histogram: A graphical way to display data with adjacent rectangular bars.

Horizontal axis: The x-axis of a coordinate system.

Integer: A counting number, negative or positive, or zero.

Intersection of sets: The elements that are common to the given sets.

Irrational number: A number that cannot be expressed as the quotient of two integers.

Isosceles trapezoid: A trapezoid whose non-parallel sides are congruent.

Isosceles triangle: A triangle with at least two congruent sides.

Kite: A four-sided figure that contains two pairs of adjacent congruent sides.

Least common multiple: The smallest integer that can be divided by a given group of integers. Also known as the lowest common denominator.