How do you cal. pi?

Question

Just wondering why it's was 3.

Answer 1

3 is a very, very rough estimate. It's calculated using a Taylor series. The best info I've found is here
http://www.jimloy.com/geometry/pi.htm

Answer 2

Hi:

To answer your question you need to know what pi is : It is the ratio of a circle's circumference to it's diameter. it a constant number that never changes no matter how big or small the diameter of the circle you make. Start by cut some paper circles of varying diameters say 1 inch , 2 inch and 3 inch take a ruler and mark a spot on the edge of the paper circle and position that spot on the zero mark on the ruler. Then carefully roll the paper circle along the ruler and see where you end up as that point return to the bottom of the circle . This is the circumference now divide that number by the circle diameter, you should get a close value for pi. of about 3.1 or 3.2

Now to answer the second part of your question.
Back about three thousand years ago the ancient Egyptians estimated Pi to be about 3 units (you have to remember that their Mathematics were quite primitive and they had no algebra to help them at this time). Later the ancient Greeks developed and used the area of triangles filling a circle method to estimate pi to be between 22/7 and 3 10/71
around 240 B.C. However this was good enough for building things and such, but is was not good enough for mathematicans however. So a quest was started to find the true value for pi and various mehods were used to get a better and better estimate for the value of pi. In about the 15th and 16 th centry A.D. Various discovery where made about Pi:

1) Pi is irrational { Meaning it does not repeat itself ever ; like 1/3} and it's transcendental { Meaning that powers of and combination of powers of pi will not give finite whole numbers } So all formulae for computing pi will be infinitely long.

2) with the devolpment of Algbera and Calculus, certain series were found to give the approximate value of pi

PI= sqr ( 6*(1 + 1/(2^2)+ 1/(3^2)+ 1/ (4^2) + 1/(5^2).....) { sqr means Square root}

or

PI = 4*( 1- (1/3)+(1/5)-(1/7)+(1/9)- (1/11)......)

Those series take a long time to come to the value of Pi that we know Pi to be today. Which bring us to our era, when electronic computers where built, and as soon as they became avialable. Mathematican were able to comfirm those series to be the appoximate value of Pi , which are still in use today. it has been calulated the about 15 tillion decimal places and is so well known that it is use to gauged the speed and power of all supercomputers and computers that made today and in the future to come. and it being surpassed in the number of decimal places to be counted in. and it pop up in some interesting places.


Here the value of pi that been calulated to a few hundred thousand places I got off the Internet:

3.

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9206240194 3518310088 2834802492 4908540307 7863875165

9113028739 5878709810 0772718271 8745290139 7283661484
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6126298082 2516331363 9952117098 4528092630 3759224267
4257559989 2892783704 7444521893 6320348941 5521044597
2618838003 0067761793 1381399162 0580627016 5102445886
9247649246 8919246121 2531027573 1390840470 0071435613

6231699237 1694848132 5542009145 3041037135 4532966206
3921054798 2439212517 2540132314 9027405858 9206321758
9494345489 0684639931 3757091034 6332714153 1622328055
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7493126163 3950012395 9924050845 4375698507 9570462226
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3315273213 1361216582 8080752126 3154773060 4423774753
5059522871 7440266638 9148817173 0864361113 8906942027
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3294294549 3878640230 5129271190 9751353600 0921971105
4120966831 1151632870 5423028470 0731206580 3262641711
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3099930275 7419916463 8414270779 8870887422 9277053891
2271724863 2202889842 5125287217 8260305009 9451082478

3572905691 9885554678 8607946280 5371227042 4665431921
4528176074 1482403827 8358297193 0101788834 5674167811
3989547504 4833931468 9630763396 6572267270 4339321674
5421824557 0625247972 1997866854 2798977992 3395790575
8189062252 5473582205 2364248507 8340711014 4980478726

Be sure to check out the Sources :

Hope this helps:

Answer 3

pi, the number of times the diameter of a circle fits into its circumference is an irrrational number. In other words, it is a number which cannot be expressed in terms of a finite number divided by a finite number. Why it is called pi (a greek letter) I do not know. But the point is that it is a mathematical fact, not given to human intervention. Many years ago, the legislature of an american state decided that math teachers were being to demanding on their students by requiring them to memorize pi as 3.14 and they actually passed a law declaring that pi was exactly 3¡ That just shows you how ignorant some legislators can be¡ There are many ways to calculate pi. If you are interested I can tell you some, but it requires some mathematical knowledge.
Pavi

Answer 4

It is not 335/113 (that would be less than 3) but 355/113 that is a good approximation to pi

Answer 5

Pi is 3.1415926535.... carried to as many places as you want. It is calculated by dividing the circumference of a circle by the diameter. The fraction 22/7 is an approximation.

Answer 6

It isn't 3. It's an irrational number. See one of the other million questions below that ask about "calculating pi" for more information...

Answer 7

its more than 3 its 3.1416..etc, i only know it to 4 places. but to simplify matters just hit the pi button on a calculator and hit enter.

or you can go research it in nature...and be in awe of natural phenomenon.

Answer 8

22/7 is the ratio of a circle's circumference to it's diameter

Answer 9

π is not 3 whatsoever.

It's the ratio of a circle's circumference to its diameter. It is an irrational number with an infinite number of digits. 3.14159...

Answer 10

The diameter measures 3x around the circle, but it doesn't fit exactly, and what really pisses me off is that it is irrational.