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**Data
**A set of numerical facts

**Data
base** A collection of data that is organized and stored electronically for
rapid search, retrieval and editing.

**Decagon**
A polygon having ten sides.

**Decimal
notation **Our notation for writing numerals using the Hindu-Arabic numerals
and place values based on the powers of ten

**Decimal
numeral **A numeral which contains a decimal point and is used for a fraction

**Decimal
point **The dot in a decimal numeral which shows where the one's place is in
the numeral

**Degree
of a polynomial ** The
exponent of the highest power term in a polynomial.

**Degree**
The most common unit of measurement for angles.

**
Denominator **The bottom portion of a fraction

**Density
** The mass per unit volume of a substance.

**Dependent
events ** Two events in
which the result of the first affects the result of the second.

**Diagonal
** 0 A segment that joins two consecutive vertices of a polygon.

**Diagonal
**(of polygon) A line segment that joins two non-consecutive vertexes of a
polygon

**Diameter
** , 0 A chord that contains the center of a circle or a sphere.
Also, the length of such a chord.

**Diameter
**A line segment which contains the center of a circle and Whose endpoints are
two points of the circle

**Digit
**Each basic (single) numeral which names a number

**Direct
measurement **A measurement made by comparing an object directly with a
standard unit of measure

**Discount**
The amount deducted from the original amount.

**Distributive
property of multiplication over** **addition
**For each number a, each number b, and each number

*c,
a x (b + c)* *(a x b) + (a x c)*

**Distributive
property **The sum of two addends multiplied by a number is the sum of the
product of each addend

and
the number. For any numbers *a. b* and*
c*, *a *x*
*(*b+c*) = *a *x*
b+ a *x* c*.

**Dividend**
A number divided by another number (divisor) resulting in a qoutient.

**Divisible**
A number is divisible by another if the quotient is a whole number and the
remainder is zero.

**Division
property of equality **If each
side of an equaltion is divided by the same nonzero number, then the two

sides
remain equal. If *a = b*, then *a/c
= b/c, c*¹
0.

**Division**
Separating into parts or portions.

**Divisor
**(in division) The number by which the dividend is to be divided

**Divisor
**(of number) A non-zero factor of a number

**Divisor**
One of two or more integers that can be exactly divided into another integer . e
number that is divided

into
another number (dividend) resulting in a quotient.

**Dodecagon
**A polygon having twelve sides.