Coordinate Plane

    A coordinate system in which the coordinates of a point are its distances from a set of perpendicular lines that intersect at an origin, such as two lines in a plane; or called the rectangular coordinate system.

    Pythagorean Theorem


    The sum of the squares of the legs of a right triangle equals the square of the hypotenuse.


    The side opposite the right angle in a right triangle.



    The point equidistant from the endpoints of a segment.



    A set of ordered pairs.



    A relation in which no two ordered pairs have the same first component and different second components.


    The set of all acceptable x-values for a function



    The set of all resulting y-values.



    Vertical Line Test

    If any vertical line intersects a graph in more than one point, the graph does not define y as a function of x.


    An angle is formed by rotating a ray around its endpoint.

    Initial Side

    A ray in its  initial position, often times on the x- axis.

    Terminal Side

    A ray in its location is the terminal side of the angle.


    The most common unit of measure for angles. 360 degrees make up a complete rotation.

    Complementary Angles

    Two angles whose sum is .

    Supplementary Angles

    Two angles whose sum is .


    An instrument used to measure angles in degrees.


    Coterminal Angles

    Angles that have the same initial side and terminal side.


    Quadrantal Angles

    Angles in standard position that terminate on the x-axis or y-axis.

    Reference Angles

    The positive  acute angle made by the terminal side of an angle and the x-axis.

    Significant Digits

    Digits obtained  by actual measurements.

    Angle of Elevation

    Acute angle formed by the x-axis and the line of sight in an upward direction.

    Angle of Depression

    Acute angle formed by the x-axis and the line of sight in a downward direction.

    Radian Measure

    Angle with its vertex at the center of a circle that intercepts an arc on the circle equal in length to the radius of the circle.

    Sector of a Circle

    The portion of the interior of a circle intercepted by a central angle.

    Linear Velocity

    The measure of how fast a point on a circle is changing position.


    Angular Velocity

    The measure of how fast an angle in standard position is changing as it moves along a circle.



    Phase Shift

    With circular functions, a horizontal translation of a graph to the left or right.


    An Identity is an equation that is true for every value in the domain of its variable.


    Conditional Equation

     A conditional Equation is only true for specific values in the domain of the variable.

    One-To-One Function

    A function defined so that each range element is only used once.

    Horizontal Line Test

    Any horizontal line will intersect the graph of a one-to-one function in at most one point.

    Inverse Function

    A function found by interchanging the components of the ordered pairs of a one-to-one function.

    Solving a Triangle

    A process in trigonometry used to identify the measure of the 3 angles and 3 sides of a triangle.


    Based on the given data, one clear conclusion can not be drawn.



    A quantity, often represented by a directed line segment,  that has both magnitude and direction.


    A vector that represents the sum of two or more other vectors.