how did pi got its value?

Answer 1

From the mathematician like 2000 years ago. Something about taking a piece of string and wrapping it around a circle, and it always wrapped around 3 times, and a little more.. and thus, there was pi.

Answer 2

Pi is the ratio of the circumference of a circle to its diameter. It is known to be irrational and its decimal expansion therefore does not terminate or repeat. The first 40 places are:

3.14159 26535 89793 23846 26433 83279 50288 41971...

Thus, it is sometimes helpful to have good fractional approximations to Pi. Most people know and use 22/7, since 7*Pi is pretty close to 22. But 22/7 is only good to 2 places. A fraction with a larger denominator offers a better chance of getting a more refined estimate. There is also 333/106, which is good to 5 places.

But an outstanding approximation to Pi is the following:

355/113
This fraction is good to 6 places! In fact, there is no "better approximation" among all fractions (P/Q) with denominators less than 30,000. [By "better approximation" we mean in the sense of how close Q*Pi is to P.]
Presentation Suggestions:
Have people verify that 355/113 is a good rational approximation. You can also point out that 355/113 is very easy to remember, since it consists of the digits 113355 in some order!

Answer 3

Pi is, by definition, the circumference of a circle divided by the diameter.

One formula for calculating pi is:

pi/4 = 1 - 1/3 + 1/5 - 1/7 + 1/9 - 1/11 + 1/13 .....
This converges very slowly.

This formula and many others are shown on the link below.

Answer 4

As far as I know people in the anciet times have actually found the value of pi be experiments.
pi = 22/7
This is actually the ratio of a circmference:diameter
circmference:diameter = 22/7
Mathematicians calculated the circumferences of innumerable circles by tieing a rope round it; then measuring the lenght of the rope.
To this they found its diameter
Taking the average of all the values
they found that if they are divided then one gets a constant value of 22/7
Which when converted to decimal gives
3.14285...
This value was later called pi
Thats how the value of pi came into being.

Answer 5

The mathematics is connected with physics.
======================
The formula: C/D = pi is belong to really particle.
Quantum of light flies with speed c=1 and has
geometrical form of a circle: C/D = pi = 3,14.
==============
So the particle ( quantum of light)
has its number pi , got its value.

Answer 6

Though Euler did find pi.

An Indian Mathematician Aryabhata found the value of pi
years before Euler to 4 decimal places.
He even calculated earths radius.
He found it by creating circle out of many
strings and then measuring their radii manually
then using 2*pi*r=lenghth of string
actually the graph of r vs length of string was a
constant.

Thats it

Answer 7

Same way protons are (+) and electrons (-).

That's the way it is, the ratio of circumference to diameter.

However, the exact true value of pi is unknown. It's only an approximation since it's rounded off.

Answer 8

pi is the ratio of the diameter of a circle to its radius and is constant.from time to time people have been trying to find the value of pi more and more accurately as it is an irrational number

Answer 9

Pi got its value from all points each of them has equal distance from one fixed point.

Answer 10

Take any circle and take the ratio of its circumference and diameter, you get a constant value and this is denoted by pai and its value is 22/7 or 3.14