Math Dictionary-R

Math Dictionary-R deals with words starting with the letter R

Radian

Radian is the ratio between the length of an arc and its radius. It is the standard unit of angular measure. 1 radian results in same arc length and radius.

Radical

n-th root of a quantity.



Radius

A line from the center to the point on the circle.

More words on  math dictionary-r are as follows:

Raise

To multiply a number by itself a certain amount of time. Example: 10 raise to the power 5 = 10⁵ = 10x10x10x10x10 = 100000.

Random

Selecting an item from the given set of items without any order. That is like drawing a number from a hat.



Range

The difference between the highest and lowest value.Example: Range of the given numbers 97,46,29, 37,18 is 97-18= 79.



Rate

Ratio that compares two different kinds of numbers or units. Example: miles per hour, dollars per pound.



Ratio

Ratio that tells how one number is related to other number. Ratio of 'a' and 'b' is written as a/b or a:b



Rational



Rational number A number that can be expressed as a ratio of two numbers.



Rational function A ratio of two polynomial functions.

Ratio formula 

Let A and B be two given points. Let P be a point on the line segment AB or AB produced. The P divides the line segment AB in to two segments AP and PB. the lengths of AP and PB are AP and PB. These lengths are in some ratio m:n or that is AP:PB =m:n or AP/PB =m/n. If P lies inside AB, we say that P divides AB internally in the ratio m:n. If P lies outside AB, that is P lies on AB produced, then we say P divides AB externally in the ratio m:n.


Ray:

A line that has a starting point but no end point.

Real numbers

All the whole, rational and irrational numbers are called real numbers.



Reciprocal

Multiplicative inverse of a number. One of two numbers whose product is 1. Example: Reciprocal of 2 is 1/2.

Rectangle

A rectangle is a 4 sided polygon whose interior angles are equal to 90 degrees. Pair of opposite sides are equal.  The lengthier sides are called as lengths 'l' and shorter sides are called as breadth 'b'. 

     More words on math dictionary-r will follow.

“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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