# Please I need clarification: What's the value of Pi

By saeedonline

@saeedonline (340)

Saudi Arabia

July 23, 2010 1:03pm CST

Some of my friends said Pi = 22/7, but I believed they were wrong. Pls who's right? I or them?

14 responses

@Konstantinus (3)

• Hungary

1 Nov 10

You can find more methods here: http://reference.wolfram.com/legacy/v5_2/Demos/Notebooks/CalculatingPi.html

@Konstantinus (3)

• Hungary

1 Nov 10

You can also compute Pi in excel with this method. Generate numbers from 1 to 1000
in column A: 1, 2, 3, and so on, 1000
and then generate their square in column B: 1*1, 2*2, 3*3, and so on, 1000*1000
and then generate their reciprocal in column C: 1/(1*1), 1/(2*2), 1/(3*3),...,1/(1000*1000)
calculate the sum of the numbers in column C, then multiply by 6, and then extract the square root. it will yield an approximate value of Pi
If you use more then 1000 numbers (eg. 50000) you will get more and more precise value of Pi.
You used this equation:
inf
sum (1/n^2) = Pi*Pi/6
1

@TheKingMan (293)

• India

23 Jul 10

Both of you are right.
The exact value of Pi is known by none. 22/7 is somewhat near to it.
3.145________. is an inacurrate value with never ending decimals and the shorter version of it, 3.14 is used for calculations.
Basically, Pi is the common ratio for the arcs and diameters for all circles.

@saeedonline (340)

• Saudi Arabia

23 Jul 10

Alright. That's what they don't know and think that's the exact value.
Thank you for your nice contribution and happy mylotting!

@SRBALAJEE05 (373)

• India

23 Jul 10

Pi refers to 22/7 or 3.14 sometimes as 180degree depends upon the condition in which it is used.

@saeedonline (340)

• Saudi Arabia

23 Jul 10

Thank you for your response. I know 22/7 or 3.14 are approximations, but the seem not to know this fact. They maintained that's the value, just in the sense of equality and not approximation. In fact, 22/7 is one of the least accurate estimates for Pi.
355/113, 333/106 are even closer to Pi than 22/7
Thanks and enjoy mylotting!

@pinky31ps (329)

• India

23 Jul 10

well dude, we don't have accurate value of pi. its estimated value is 3.14. when we dont want to complicate the calculation, we use 22/7. its just like that. simple..

@tap0991 (2767)

• United States

23 Jul 10

That is the correct estimate pi as a fraction. The only thing wrong about the fraction is fractions do not always express the whole amount to the desirable decimal. Pi has been calculated up to 1 million decimal places and I believe it is still growing.
Here is the first 10,000 decimal places-http://www.math.utah.edu/~pa/math/pi.html
Here is up to 8 million-http://andyslife.org/misc/Pi%20to%208M%20places/pi-8M.php