# Glossary

The triangle defined by the three angles: 30 degrees, 60 degrees, and 90 degrees is a special triangle that has meaningful properties in mathematics.

The triangle defined by the three angles: 45 degrees, 45 degrees, and 90 degrees is a special triangle that has meaningful properties in mathematics.

An acute angle is defined as an angle smaller than a perpendicular angle.

An angle is defined as the amount of rotation between two rays. The point where the rays start is called the vertex.

Area is the physical amount of two-dimensional space that a shape takes up.

An array is a computer programming construct for storing contiguous data. The data can be accessed by indexing into the array with the location of each element.

A circle is a basic shape used throughout mathematics. A circle is defined as the shape where every point along its perimeter is an equal distance from its center.

A coefficient is a variable associated with a number that implicitly represents multiplication between the variable and the number.

A mathematical constant is a significant value that mathematicians have assigned a symbol representation.

Degrees are a unit that measure angle. The degree angle system divides a full rotation into 360 units called degrees.

The determinant is a function that maps the values in a matrix to a number. Using this number, certain properties can be detirmined. For example, like whether or not the matrix has an inverse.

The domain of a function is the set of all possible input values where the function has defined output.

An implicit curve is formed by the set of points where an equation is true.

In math an interval represents the valid values between an upper limit and a lower limit.

The mean of a data set is the average of all the values in the data set.

The median of a data set is the middle value of the sorted data.

The mode of a data set is the most commonly occurring value in the data set.

Numbers are the building blocks of mathematics. A number represents a quantity expressed using symbols.

An angle greater than 90 degrees.

In computing and math a parameter refers to the input to a function. For example, a and b are the parameters to the function f(a,b).

At a right angle to the line, surface or plane.

A perpendicular angle is equal to a quarter of a full rotation.

A point represents a position in space. In modern mathematics, space is represented using the cartesian coordinate system where there is an origin and the position of a point in space is measured by its distance from the origin.

The general form of the quadratic equation describes all possible equations of the second degree. The shape formed by the quadratic equation is called a parabola.

A radian angle is measured by the ratio of the angle's arc-length over the radius of a circle.

A random variable represents an event whose outcome is unknown.

A right triangle is a triangle where one of the three angles is a perpendicular angle. There are three sides of the right triangle: the adjacent, opposite, and hypotenuse sides.

A series is the operation of adding an infinite number expressions together. A series is denoted using the summation operator and the index variable k.

A set is a collection of elements that are unique. Conceptually a set is a useful tool to think about and formalize problems.

This page describes the basic elements and properties of a sphere.

SVG is an XML programming standard for creating vector graphics.

a straight line or plane that touches a curve or curved surface at a point, but if extended does not cross it at that point.

TeX is a popular typesetting system for authoring technical documents and math expressions.

A triangle is a three sided geometric shape. The shape forms a basis for the subject of trigonometry and is used throughout mathematics and programming.

Unicode is a programming standard for encoding characters used for languages in operating systems and the world wide web.

A variable is a core concept in algebra where a symbol, usualy a lower case latin letter, is used as a placeholder in a math expression.

A vector has direction and magnitude.

Volume measures the amount of three-dimensional space an object occupies.

A wave form in mathematics is often expressed as an equation, or a curve fitted through some points.

An x-intercept is a point where an equation crosses the x-axis.