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 Decimal number A number written in the place-value notation with base 10. For example 5.321 Decimal notation The method of positional notation used in real number system. A real number can be either rational or irrational. A rational number can be written as a terminating decimal or repeating decimal number. For example, 3/4 = 0.75  is a terminating decimal number and is a repeating decimal number where 3 is repeating forever and never ending. Howeveris an irrational number which is neither terminating nor repeating. Decimal system A number system using base ten. Degree A degree is a measure of angle forming by two rays. A complete revolution is 360o. therefore the measure of a right angle is 900.  Radian is a different measure of angle, in which is the measure of a complete revolution. allows us to convert from one measure to the other. Denominator The bottom number (or expression) in a fraction. For example, in the fraction, 3/5, 5 is the denominator.  See Fraction. Degree of a monomial The degree of a monomial in one variable is the value of the exponent of the variable. The degree of a monomial with more than one variable is the sum of the exponents of the variables in that monomial. For example in 4x2y3z , x has degree 2 ,  y degree 3 and z degree 1. The degree of the whole term is the sum of  these exponents, in this case 2+3+1 = 6. Degree of a polynomial The degree of a polynomial is the degree of the nonzero term with the highest degree. For instance,  x+xy+2y+5  is a polynomial of second degree, since xy has degree 2. Diagonal A line segment connecting any two vertices of a polygon that are not lying on the same side of the polygon. Diameter A chord passing through the center of a circle or sphere. Digit Any of the ten Arabic numerals of the decimal system, e.g.,   0, 1, 2, 3, 4, 5, 6, 7, 8, 9 Dimension The number of coordinates required to locate a point, usually in a plane or a space. Discriminant  The algebraic expression, , associated to the general quadratic equation . Solutions of a quadratic equation are distinct real numbers, equal real numbers or conjugate complex numbers when Quadratic Equation Distance The length of shortest line segment joining the given points. Distribute law An axiom of a particular formal system that states for a given pair of operators that one distributes over the other. In arithmetic (or algebra) the multiplication is distributive over addition, in symbolically   . This important and useful law allows to replace an expression with parenthesis for an equivalent one without it, allowing simplification of expression in algebra.  Removing Parenthesis. Division The inverse operation of multiplication. For instance, , a is the dividend and b is the divisor.