Online Math Dictionary: F

Easy to understand math definitions for K-Algebra mathematics
Just scroll down or click on the word you want and I'll scroll down for you!

face of a polyhedron factor in arithmetic factor in algebra
factorial Fibonacci numbers finite
formula fractal fraction


Face of a Polyhedron
A face of a polyhedron is one of the sides. 
Example:  In the dodecahedron on the right, we can see one green faceone purple facetwo red facesand two blue faces.  (There are six more faces on the back side that we can't see.) 
For  more info on polyhedra, check out myPolyhedra Gallery.

face of a polyhedron

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Factor in Arithmetic
A factor in arithmetic is one of the two or three (or more) things we multiply together to get our answer.  In the examples below, the factors are the blueand red numbers.
Examples:    6  2 x 3        120 = 4 x 5 x 6  
For more info, check out my Multiplication Lessons.
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Factor in Algebra
Factors in Algebra are the same thing as factors in arithmetic... Factors are the things we multiply together to get answers.  In the example below, the factors are in red and blue.
For some great lessons on factoring, check out my factoring lessons.

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Here's the official formula for a factorial:

    n! = n x (n-1) x (n-2) x ... x 3 x 2 x 1

It looks creepy, but it isn't.
Example:   4! = 4 x 3 2 1 = 24      
   5! = 5
 x 4 3 2 1 = 120     3! = 3  x 2 1

0! is specially defined as:  0! 1
For more info on factorials, check out my factorials lesson.