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Degree (angle) - The measure of rotation of a ray around its endpoint equal to one-360th of a full rotation. The rotation is measured relative to another ray with the same endpoint (vertex). The other ray forms the other side of the measured angle. See Degree (arc), central angle. One angle-degree is equal to pi/180 radians.
Degree (arc) - The measure of an arc consisting of one-360th of the circumference of a circle. See central angle. One angle-degree is equal to pi/180 radians of arc.
Degree (temperature) - A unit of temperature measurement. The scale can be in degrees Fahrenheit, Celsius (centigrade) or Kelvin (absolute). See the explanation on Temperature Conversions.
Denominator - The bottom part of a fraction. When changing a fraction to a decimal, the divisor, the number to divide by. See Numerator.
Dependent variable - The controlled or output value of a function. The results of applying data or conditions to a rule. The set of values for the dependent variable is the range of the function. See independent variable, domain.
Difference - The result of a subtraction. A remainder. A comparision or contrast of a given quantity or quality.
Dimension - A direction or quality not definable in terms of any other direction or quality within a given system. Physical dimensions are generally defined as perpendicular to each other. See coordinates, graph.
Distance - The interval in a plane or in space between two points. The length of a segment connecting two figures or parts of a figure and perpendicular to both. See the explanation on Finding Distances.
Distributive property - In order to multiply two expressions, each term of one expression must be multiplied by each term of the other expression. The number of terms resulting, before simplifying like terms, is the product of the number of terms in each expression. The most common forms are one-by-two (monomial times binomial) and two-by-two (binomial times binomial, commonly known as FOIL). See the explanation on Multiplying Polynomials. The distributive property may also be used to divide a polynomial by a monomial (the monomial must be the divisor). See the explanation on Dividing Polynomials.
Dividend - The number to divide. The number inside the division box. The first number in a division expression. The first number entered when dividing by calculator. The "is" number in a division equation such as a Type 2 or 3 percent problem. See the explanation on Percent.
Divisible - Divides exactly. Remainder is zero after division. Factorable. See the explanation on Divisibility Tests.
Division - A shortcut for repeated subtraction. The quotient is equal to the number of times the divisor can be subtracted from the dividend before the remainder is less than the divisor. In word problems, how many times does one quantity fit into another? In hand calculations, the dividend is the number in the box. On a calculator, the dividend is entered first.
Divisor - The number to divide by. The number outside the division box. The second number in a division expression. The second number entered when dividing by calculator. The "of" number in a division equation such as a Type 2 or 3 percent problem. See Factor. See also the explanation on Percent.
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Last updated 6/2/97 - 4/11/2000.