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-   -   How is/was "pi" calculated? (https://www.quiltingboard.com/general-chit-chat-non-quilting-talk-f7/how-%22pi%22-calculated-t106317.html)

bearisgray 03-09-2011 11:21 AM
I was taught that "pi" is the ratio of the radius and/or diameter of a circle to its circumference.

What circle's circumference and diameter were measured to be able to get a number that has hundreds of numbers after the decimal point?

For many practical purposes, 22/7 (3-1/7) or 3.1416 seems to be a fairly close approximation.

emerald46 03-09-2011 11:23 AM
lol...I remember 3.14 from school.

isnthatodd 03-09-2011 11:25 AM
The decimal number is just a close approximation of the irrational fraction 22/7.

emerald46 03-09-2011 11:28 AM
Pi is the ratio of the circumference of a circle to its diameter. Pi = C/D. Pi is always the same number. Pi = 3.14159 rounded..how about this..Sorry I love math!

quilt1950 03-09-2011 11:30 AM
Originally Posted by bearisgray
I was taught that "pi" is the ratio of the radius and/or diameter of a circle to its circumference.

What circle's circumference and diameter were measured to be able to get a number that has hundreds of numbers after the decimal point?

For many practical purposes, 22/7 (3-1/7) or 3.1416 seems to be a fairly close approximation.
I do believe that the ratio of the circumference to the diameter of ANY circle will be 'pi'. It's also the ratio of the area of the circle to the square of its area.

Are you celebrating National PI day next Monday (3/14)?

Vickymomof6 03-09-2011 11:37 AM
In my circles pi is spelled pie and it is usually sliced in about 6 to 8 pieces.


Sorry I couldn't resist :-P

ktbb 03-09-2011 11:37 AM
Emerald and quilt1950 are correct...doesn't make any difference on the circumference...the ration of circum. to diameter is ALWAYS pi.

jdiane318 03-09-2011 11:50 AM
Whatever it is, isn't it obvious that only a man could come up with something neverending and repetitious? A woman wouldn't.

feline fanatic 03-09-2011 11:51 AM
Originally Posted by Vickymomof6
In my circles pi is spelled pie and it is usually sliced in about 6 to 8 pieces.


Sorry I couldn't resist :-P
ROFL!! 6 to 8?!!? in my circles we are lucky to get 4! :XD:

greensleeves 03-09-2011 12:19 PM
Originally Posted by ktbb
Emerald and quilt1950 are correct...doesn't make any difference on the circumference...the ration of circum. to diameter is ALWAYS pi.
Ditto!

kraftykimberly 03-09-2011 01:29 PM
Originally Posted by Vickymomof6
In my circles pi is spelled pie and it is usually sliced in about 6 to 8 pieces.


Sorry I couldn't resist :-P
I with her :-)

TootieAnn 03-09-2011 01:31 PM
Originally Posted by feline fanatic
Originally Posted by Vickymomof6
In my circles pi is spelled pie and it is usually sliced in about 6 to 8 pieces.


Sorry I couldn't resist :-P
ROFL!! 6 to 8?!!? in my circles we are lucky to get 4! :XD:
Very funny! My husband would love it. He teaches Math.

sewingsuz 03-09-2011 04:12 PM
You girls are impressive. I was smarter than a 5th grader last yr and now he is in 6th and it is getting harder. I can't even tell if some of his homework is correct.

bearisgray 04-17-2011 12:38 PM
3 1/7 ends in a repeating decimal.

3.142857142857........

from what I've read, "pi" does not have repeating numbers in the decimal portion

JanetM 04-17-2011 12:47 PM
Originally Posted by Vickymomof6
In my circles pi is spelled pie and it is usually sliced in about 6 to 8 pieces.


Sorry I couldn't resist :-P
:lol: :lol: :lol: Same here...and I like Boysenberry!

bearisgray 04-17-2011 02:56 PM
Originally Posted by JanetM
Originally Posted by Vickymomof6
In my circles pi is spelled pie and it is usually sliced in about 6 to 8 pieces.


Sorry I couldn't resist :-P
:lol: :lol: :lol: Same here...and I like Boysenberry!
i like French Silk and Pecan

genafan201 04-17-2011 03:38 PM
ooohhhh!!! French Silk yum, yum!!!

I don't know HOW it was figured, but I'm pretty sure it was figured by someone with WAY too much time on their hands...Obviously NOT a quilter :)

bjnicholson 04-17-2011 03:43 PM
Wait...I think my head just exploded...

ptquilts 04-17-2011 04:07 PM
If you really want your head to explode, read this

http://en.wikipedia.org/wiki/Pi

sewingsuz 04-17-2011 04:25 PM
I am not smarter than a fifth grader. I forgot all of this if I knew it.

genafan201 04-17-2011 04:37 PM
Originally Posted by ptquilts
If you really want your head to explode, read this

http://en.wikipedia.org/wiki/Pi
Whew! I made it almost through the first line... :shock:


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