Valid argument
In logic, refers to a correctly inferred logical argument.
Variable A
symbol that represents unspecified elements of a given set.
On a calculator, it refers to the name given to a location
in the memory that can be assigned a value.
Variable
expression An expression that contains at least
one variable.
Variance
Velocity An
instantaneous rate of change; a directed speed.
Venn diagram
A diagram used to illustrate relationships among sets.
Vertex (1) A vertex
of a polygon is a corner point, or a point of intersection
of two sides. (2) A vertex of a parabola is the lowest point
for a parabola that opens upward; the highest point for
one that opens downward; the leftmost point for one that
opens to the right; and the rightmost point for one that
opens to the left.
Vertex angle
The angle included between the legs of an isosceles triangle.
Vertical angles
Two angles such that each side of one is a prolongation
through the vertex of a side of the other.
Vertical ellipse
An ellipse whose major axis is vertical.
Vertical hyperbola
A hyperbola whose transverse axis is vertical.
Vertical line
A line with undefined slope. Its equation has the form x
= constant.
Vertical Line
Test Every vertical line passes through the graph
of a function in at most one point. This means that if you
sweep a vertical line across a graph and it simultaneous
intersects the curve at more than one point, then the curve
is not the graph of a function.
Volume A number
describing three-dimensional content of a set. Specifically,
it is the number of cubic units enclosed in a solid figure.
Vote A decision
by a group on a proposal, resolution, law, or a choice between
candidates for office.
