Undecagon (Hendecagon ) : An 11-sided polygon (a flat shape with straight sides).
Undefined slope : Slope is given by the formula as
m = (y2 -y1)/(x2 -x1); when the denominator is zero then it is undefined slope.
Undefined terms : The fundamental components of an axiomatic system whose understanding is agreed upon but not formally defined. In geometry undefined terms traditionally include point, line, and plane.
Unequal : Not equal. The symbol is ≠ .
Union of sets : The union of two or more sets is the set of all elements contained in at least one of the sets.
Unit circle : A circle drawn with unit(1cm) radius.
Unit Fraction : A fraction where the top number (the "numerator") is 1.
Uniform : Throughout the same.
Unit of Measurement : A quantity used as a standard of measurement.
Unit Price : The cost per liter, per kilogram, per pound, etc, of what you want to buy.
Units : How many ones. How many single items.
Used to show the "ones" place value (units, tens, hundreds, etc).
Univariate Data : Data for one variable.
This page is about Math Dictionary v. V
Valid argument: A logical argument supported by known facts or assumed axioms; an argument in which the premise leads to a conclusion.
Variable : A symbol for a number we don't know yet. It is usually a letter like x or y.
Vector: A quantity that has both magnitude and direction; represented geometrically by a directed line segment.
Vertex of an angle: The point of intersection of the two rays that form the sides of the angle.
Vertex of a polygon A point where the edges of a polygon intersect.
Vertex of a cone or pyramid: The fixed point, not in the plane of the base, to which all points on the perimeter of the base are connected.
Vertical angles: The two nonadjacent angles formed when two lines intersect.
Vinculum : A vinculum is the horizontal line used to separate the numerator and denominator in a fraction.
It can also be any horizontal line placed over an expression to show that everything below the line is one group.
Volume :A measure of the number of cubic units needed to fill the space inside a solid figure.