# Glossary Term Definition two-column proof A deductive argument

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```					     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.

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