what is pi(π) and what is its value?

                           

What is pi(π)?
Ans:- The ratio of a circle’s circumference (the distance around it) to its diameter (the distance across it) is always equal to pi.  No matter how large or small a circle is, pi will always work out to be the same number. Most commonly, pi is used to answer questions about anything circular or spherical.

Credit: NASA/JPL-Caltech

Value of pi(π):

Digits: The first 50 decimal digits are 3.14159265358979323846264338327950
288419716939937510

Fractions: Approximate fractions include (in order of increasing accuracy) 22/7, 333/106, 355/113, 52163/16604, 103993/33102, 104348/33215, and 245850922/78256779


Pi(π) is an irrational number, which means that it is a real number that cannot be expressed by a simple fraction and equivalently its decimal representation never ends and never settles into a permanently repeating pattern. Still, fractions such as 22/7 and other rational numbers are commonly used to approximate π.

Also, π is a transcendental number; that is, it is not the root of any polynomial having rational coefficients. 

Credit: NASA/JPL-Caltech

. Name 

The symbol used by mathematicians to represent the ratio of a circle's circumference to its diameter is the lowercase Greek letter π, sometimes spelled out as pi, and derived from the first letter of the Greek word perimetros, meaning circumference.