• TRIGONOMETRY – WORD WALL

    TERM

    DEFINITION

    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.

    Hypotenuse

    The side opposite the right angle in a right triangle.

     

    Midpoint

    The point equidistant from the endpoints of a segment.

     

    Relation

    A set of ordered pairs.

     

    Function

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

    Domain

    The set of all acceptable x-values for a function

     

    Range

    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.

    Angles

    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.

    Degree

    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 .

    Protractor

    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.

    Identity

    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.

    Ambiguous

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

     

    Vector

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

    Resultant

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