Cool math .com - Online Math Dictionary

Online Math Dictionary: V
Easy to understand math definitions for K-Algebra mathematics
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variable	vector	vertex
vertical	volume

Variable
In Algebra, a variable is the letter in an equation that represents an unknown number.
Examples: 2x + 5 = 7 2x - 3y = 6

Vector
A vector is a ray that has a magnitude (length) and a direction (which way it's pointing.) Vectors are used a lot in physics and navigation.

vectors

Vertex
On a polygon, the vertices (the plural of vertex) are the corners.

In a parabola, the vertex is the starting point. The line that cuts the parabola in half (the axis of symmetry) goes right through the vertex.
vextex of a parabola

Vertical
A vertical line is a line that goes up and down... A vertical line is perpendicular to the horizon.

Volume
Volume is the amount of space inside of something like a cube. Volume is always measured using linear measurements (like inches and centimeters) cubed to represent three dimensions.
Example: For the cube on the right, the volume is 75 cubic inches. This means that you can fit 75 little one inch cubes inside!