Glossary Term Definition two-column proof A deductive argument

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Glossary Term Definition two-column proof A deductive argument Powered By Docstoc
					     Glossary Term                                        Definition
two-column proof            A deductive argument that contains statements and reasons
                            organized in two columns.
unbiased sample             A sample that is selected so that it is representative of the entire
                            population.
uniform tessellations       Tessellations containing the same arrangement of shapes and
                            angles at each vertex.
union                       The graph of a compound inequality containing the word or; the
                            solution is a solution of either inequality, not necessarily both.
unit circle                 A circle of radius 1 unit whose center is at the origin of a
                            coordinate system.
unit rate                   A rate with a denominator of 1.
unit vector                 A vector of length 1 that is parallel to the x-, y-, or z-axis.
unlike fractions            Fractions whose denominators are different.
upper bound                 The integer greater than or equal to the greatest real zero of the
                            polynomial function P(x).
upper extreme               The greatest number of a set of data.
upper quartile              The median of the upper half of a set.
variable                    A letter or other symbol used to represent an unspecified
                            number or value.
variance                    The mean of the squares of the deviations from the arithmetic
                            mean.
vector                      A directed segment representing a quantity that has both
                            magnitude, or length, and direction.
Venn diagram                A diagram that uses circles to show relationships among sets of
                            numbers or objects.
vertex form                 A quadratic function in the form y = a(x – h)2 + k, where (h, k) is
                            the vertex of the parabola and x = h is its axis of symmetry.
vertex of an angle          The common endpoint of the rays forming the angle.




vertex of a conic section   A point at which a conic section intersects its axis of symmetry.
vertex of a parabola        The maximum or minimum point of a parabola.
vertex of a prism           The point where three or more planes intersect.
vertical angles             Opposite angles formed by the intersection of two lines. In the
                            figure, the vertical angles are ∠1 and ∠3, and ∠2 and ∠4.




vertical line test          A test used to determine if a relation is a function.
volume                      The number of cubic units needed to fill the space occupied by
                            a solid.