# Math Dictionary f

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**F**

**Face of a polyhedron**Any one of the polygons that bound a polyhedron.

**Factor :**Factors are the numbers you multiply together to get another number.

**Factorial :**The result of multiplying a series of descending natural numbers, such as 4, 3, 2, 1.The symbol is "!"

**Factoring :**Finding what to multiply to get an expression. (Called Factorizing in British English.)

**Fahrenheit :**Fahrenheit is a temperature scale.It is used to tell how hot or cold something is.It is often written as ° F.

**Fibonacci Sequence :**The sequence of numbers: 0,1,1,2,3,5,8,13,21,...

Each number equals the sum of the two numbers before it.

**Finite number :**A definite number.

**Fixed point**A point that is its own image under a transformation of the plane.

**FOIL method :**A handy way to remember how to multiply two binomials.It is the sum of:

multiplying the

**First**terms, multiplying the

**Outside**terms, multiplying the

**Inside**terms, and multiplying the

**Last**terms

**Foot of an altitude**The point of intersection of an altitude and the line or plane to which it is perpendicular.

**Fortnight :**A time period of 14 days (2 weeks).

**Frequency :**How often something happens during a period of time.

**Fraction :**It is a part of a whole.

**Frequency Distribution :**A table that lists a set of scores and their frequency (how many times each one occurs.

**Frequency Histogram :**A graph that uses vertical columns to show frequencies (how many times each score occurs).There should not be any gaps between the bars.

**Frequency Polygon :**A graph made by joining the middle-top points of the columns of a frequency histogram.

**Frequently :**Occurs or done often.

**Function**A rule that assigns to each number x in the function's domain a unique number f(x) .

**Math dictionary f**

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