====== Glossary of Geometry Terms ======

[b]area[/b]—the two-dimensional surface included within a set of lines

[b]axis[/b]—a straight line that divides a shape symmetrically

[b]circumference[/b]—the outer boundary of a circle

[b]constant[/b]—a number that in a given mathematical situation doesn’t change

[b]equilateral[/b]—having all sides of equal length

[b]irrational number[/b]—a number that can’t be derived from dividing one ordinary whole number into another, and whose decimal continues without end and without repeating sequences

[b]polygon[/b]—a two-dimensional shape that’s closed (no gaps between lines) and made of straight lines; a [b]regular polygon[/b] is a polygon with all sides of the same length and all angles of equal size

[b]radius[/b]—a straight line from the center of a circle to its circumference, or from the center of a regular polygon to any of its vertices

[b]ratio[/b]—the size relationship between two numbers

[b]square root[/b]—to get the square of a number, multiply it by itself (3 squared = 3 x 3 = 9); the square root of a number is the value that, when squared, gives you that number (the square root of 9 = 3)

[b]subset[/b]—a smaller group within a larger group: for example, transcendental numbers are a subset of irrational numbers (all transcendental numbers are irrational numbers, but not all irrational numbers are transcendental numbers)

[b]transcendental number[/b]—a special class of irrational numbers that defy easy mathematical description

[b]vertex[/b] (plural [b]vertices[/b])—the point at which two straight lines meet

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