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8th Grade Math STAAR Vocabulary

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  • The number that is in front of the variable in an algebraic expression
    Coefficient
  • A transformation of a figure that flips the figure across a line
    Reflection
  • Shapes that are the same shape but different sizes
    Similar
  • The longest side in a right triangle
    Hypotenuse
  • The set of numbers that includes rational and irrational numbers
    Real Numbers
  • A three-dimensional figure with one vertex and one circular base
    Cone
  • A transformation in which a figure is turned around a point
    Rotation
  • The initial amount of money borrowed or saved
    Principal
  • The number of cubic units needed to fill a given space
    Volume
  • The original figure in a transformation
    Pre-Image
  • The distance of a number from zero on a number line
    Absolute Value
  • A three-dimensional figure with 2 congruent polygon bases and all remaining sides are parallelograms
    Prism
  • __________ Correlation - When one set of data values increases while the other decreases
    Negative
  • Lines that intersect to form right angles
    Perpendicular
  • Having the same size and shape
    Congruent
  • A relationship that has exactly one output (y) for each input (x)
    Function
  • A transformation that enlarges or reduces a figure
    Dilation
  • A measure of the steepness of a line on a graph
    Slope
  • The sum of the areas of the faces of a three-dimensional figure
    Surface Area
  • A linear relationship between two variables that can be written in the form y=kx, where k is a nonzero constant
    Direct Variation or Proportional Relationship
  • The point where the x-axis and y -axis intersect on the coordinate plane
    Origin
  • A transformation in which a figure is moved along a straight line (Slides)
    Translation
  • The unit of measure for angles or temperature
    Degree
  • A pair of opposite congruent angles formed by intersecting lines
    Vertical Angles
  • A pair of angles on the same side of the transversal and between the two lines intersected by the transversal
    Same Side Interior Angles
  • Interest earned or paid on the principal and previously earned or paid interest
    Compound
  • Two angles whose measures add up to 90°
    Complementary
  • A three-dimensional figure with two parallel, congruent circular bases connected by a curved lateral surface
    Cylinder
  • A set of two or more equations with two or more variables
    Systems of Equations
  • Money earned by saving/investing or money charged for borrowing
    Interest
  • A line segment that passes through the center of a circle and has endpoints on the circle
    Diameter
  • The set of whole numbers and their opposites
    Integers
  • A number that cannot be expressed as a ratio of two integers or as a repeating/terminating decimal
    Irrational Number
  • A pair of angles that lie on the same side of the transversal and on the same sides of the other two lines
    Corresponding
  • The sum of a set of data divided by the number of items in the data set
    Mean
  • The description of the relationship between two data sets.
    Correlation
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