Math Dictionary-d gives the meaning for words starting with letter **D**

In math

Day Arithmetic is one of the important topic which is given some considerable weight age in SAT exam and other competitive exams.If the divisor m=7, then the arithmetic modulo 7 is called the day clock arithmetic. The remainders are 0,1,2,3,4,5,6 correspond to week days Sunday, Monday, Tuesday, Wednesday, Thursday and so on.

__Decade:__

Decade is a period of 10 years.For example Decade of the 20th century.

__Decagon:__

A polygon having 10 angles and 10 sides.

More math dictionary-d words are discussed below.

__Decahedron:__

In geometry, decahedron is a polyhedron with 10 faces.

** Decimal**:

Decimal is a real number system based on 10. Examples are Roman numerals, Brahmi, numerals, Hindu-Arabic numerals and Chinese numerals.

__Denominator:__

The lower part of the fraction is called denominator. For example in 3/4, 4 is the denominator.

__Deductive proof and deductive reasoning:__

In number theory, proof based on logical arguments that is justified by axioms or theorems. Deductive reasoning showing certain statements follow logically some stated assumptions.

__Descending order:__

Numbers or given data arranged from largest to the smallest is called descending order.

The degree of a polynomial is the highest degree for a term with non-zero coefficient in a polynomial. The degree of a term is sum of the powers of each variable in the term.

** Diagonal:** A line segment that connects two non-consecutive vertices of a polygon.

AC and BD are diagonals of the square ABCD.

More math dictionary-d words are given below.

**Diameter: **

A line passing through the center of the circle joining two points on the circumference of the circle.

__Divisibility Test__

Divisibility Test is the topic in which we are going to see the shortcuts to predict one number is divisible by another number with out doing too much calculation.

Two or more sets are said to be disjoint if they have no common elements.Disjoint-sets are also known as non overlapping sets.

For example:

A={2,4,6,8} and B={1,3,5,7}. Here A and B have no common element. So A and B are disjoint sets.

In mathematics we have different forms of numbers. The classification of numbers are natural number, whole number,Integer, fractions, decimals, percents, irrational and rational numbers, real numbers and complex numbers.

**Dividend:**

In division, the number which is to be divided or the number which we are dividing.

For example 8 **÷ 4 = 2**

Here 8 is the dividend

**Dodecagon**

Dodecagon is a 12 sided polygon.

**Dodecahedron:**

A polyhedron with 12 sided pentagons. When it is regular it is one of the platonic solids.

“Mathematics, without this we can do nothing in our life. Each and everything around us is math.

Math is not only solving problems and finding solutions and it is also doing many things in our day to day life. They are:

It subtracts sadness and adds happiness in our life.

It divides sorrow and multiplies forgiveness and love.

Some people would not be able accept that the subject Math is easy to understand. That is because; they are unable to realize how the life is complicated. The problems in the subject Math are easier to solve than the problems in our real life. When we people are able to solve all the problems in the complicated life, why can we not solve the simple math problems?

Many people think that the subject math is always complicated and it exists to make things from simple to complicate. But the real existence of the subject math is to make things from complicate to simple.”

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**Math Dictionary **