# 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

 VectorA 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.
 VertexOn 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 parabolain half (the axis of symmetry) goes right through the vertex.

 VerticalA vertical line is a line that goes up and down...  A vertical line isperpendicular to the horizon.

 VolumeVolume 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!

 A B C D E F G H I no J's K L M N O P Q R S T U V W no X's no Y's no Z's