|V||Roman Numeral for 5|
|variable||subject to change. A letter or a symbol used to represent a number. For example in the expression 2x + 3 = 9, x is the variable|
|varies||if x varies directly with y, then x α y and so x = ky, where k is the constant of variation|
|varies inversely||if x varies inversely with y then x α 1/y and so x = k/y, where k is the constant of variation|
|velocity||speed. The rate of change of distance over time. V = dx/dt|
|Venn diagrams||the name given to diagram to represent two or more sets, most commonly used in probability
|vertex||corner of a shape|
|vertex of a parabola||x coordinate = –b/2a|
|vertical||a line that is straight up and down, perpendicular to horizontal
|vertical line test||if a vertical line is drawn through a graph and it cuts the graph at only one point, the graph is said to be a function. If it cuts more than once, it is not a function.
In the first diagram the red line cuts the curve in two places, therefore it is not a function. In the second diagram it only cuts it once, therefore it is a function.
|vertically opposite||vertically opposite angles are equal to each other
|vinculum||the line in a fraction separating the numerator (top) from the denominator (bottom)|
|volume||the amount of space a 3d shape takes up. Formulas for volume vary from shape to shape, the most basic being for a rectangular prism where V = ℓbh|
|vulgar fraction||another term for common fraction, any fraction with a numerator (top) and a denominator (bottom)|