# Math Dictionary v

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**U**

**Uncountable :**The data which we can not count.

**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.

**Vulgar Fraction :**Another word for Common Fraction.

**Math dictionary v**

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