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The best spot for math. Mathematical "F" Words
*Dictionary Alert


face of polyhedron Any of the polygonal regions that form the surface of a polyhedron.
Triangles are the faces of a triangular pyramid.

factor A number that divides another number exactly. Also called divisor.

figure A set of points.

finite decimal  A decimal that ends. Also called terminating decimals.

flip A transformation in which each point is mapped onto its reflection image over a line or plane.

flow chart A diagram that shows a step-by-step progression through a procedure or system.
It's like a map of the procedure.

foot (ft) A unit of length in the U.S. system of measurement equal to 12 inches. Also 1 foot = 30.48 cm, 3 feet = 1 yard, 5,280 feet = 1 mile.

formula A sentence in which one variable is written in terms of other variables.

Ex: a = lw

45-45-90 triangle An isosceles right triangle whose angles measure
45, 45, 90. The Pythagorean Theorem guarantees that if the sides are each x units long, then the hypotenuse will be the square root of two times x units long.
This relationship always works.

fraction A number written in the form a/b, where b is non zero.

fraction bar  A grouping symbol separating the numerator and denominator of a fraction and standing for division.
The denominator is always on the outside of the long division symbol.

fundamental region A region which is used to tessellate a plane.
This pattern will continue in all directions forever.


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