where did it come from? who found it? How?
2007-07-17 19:55:22 · 11 answers · asked by jacinta s 2 in Science & Mathematics ➔ Mathematics
Dan pretty much gave you the answer, but I'm just going to expand it a tiny bit.
Pi is the constant of the relationship between the diameter and the circumference of a circle.
The circumference of a given circle is about 3.14 times the diameter of that circle. So if the diameter of a circle is 1 meter, the circumference is roughly 3.14 meters. Those are approximate values as pi can be calculated to infinity.
2007-07-17 21:06:01 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Pi is just a constant of proportionality between the circumference of a circle and the diameter of the circle.
In practical terms it came up in ancient times when one wanted to measure a distance by counting how many times a wheel turns as the wheel is pushed along the path to be measured. In making the wheel one would want to know what diameter to use to get a given circumference.
see http://www.exploratorium.edu/pi/history_of_pi/index.html
2007-07-17 20:08:03 · answer #2 · answered by Dan Peirce 5 · 1⤊ 0⤋
No one seems to have said that pi is the result of dividing the circumference of a circle by its diameter. Any circle, no matter what its size, gives the same result when the circumference is divided by its diameter namely three and a bit. It proved impossible to find its exact value, for reasons that I don`t fully understand, and was given the letter pi.
2007-07-17 23:14:04 · answer #3 · answered by Twiggy 7 · 0⤊ 1⤋
The value of Ï has been known in some form since antiquity. As early as the 19th century BC, Babylonian mathematicians were using Ï = 25⁄8, which is within 0.5% of the true value.
The Egyptian scribe Ahmes wrote the oldest known text to give an approximate value for Ï, citing a Middle Kingdom papyrus, corresponding to a value of 256 divided by 81 or 3.160.
2007-07-17 19:58:05 · answer #4 · answered by Anonymous · 0⤊ 0⤋
circumference of a circle = 2*pi*r where r is radius
Area of a circle = pi*r^2
2007-07-17 20:04:34 · answer #5 · answered by Jain 4 · 0⤊ 1⤋
In circle with radius r and diameter, d:-
d = 2 r
Area = Ï r ² = Ï (d ² / 4)
Circumference = Ï d = 2 Ï r
2007-07-20 21:46:39 · answer #6 · answered by Como 7 · 0⤊ 0⤋
the circumference
2007-07-17 19:58:03 · answer #7 · answered by Evan S 1 · 0⤊ 1⤋
omg i don't rember but wat the numbers r but there is this kids book that will tell u bout but i forgot the name i think it is radice and the great dragon or somthing like that
2007-07-17 19:59:58 · answer #8 · answered by latigerchick 2 · 0⤊ 1⤋
PI + PI = peepee ^^
2007-07-17 20:14:01 · answer #9 · answered by arealsexyguy 3 · 0⤊ 1⤋
it measures their circumfrence.
2007-07-17 19:58:12 · answer #10 · answered by 1 2 · 0⤊ 1⤋