Phy is meant to be a neverending number like pie (3.14159 etc etc)
2007-03-23 01:02:19 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Phi is the golden ratio. It is the solution of : x - 1 = 1/x
x = (1 + sqrt(5)) / 2 = 1.61803398874989484
http://goldennumber.net/phi20000.htm
2007-03-23 01:06:21 · answer #1 · answered by Anonymous · 1⤊ 0⤋
The golden ratio.
(1 + SQRT(5) )/2 = 1.6180339887498948...
What is interesting (in addition to what others have said) is that the fraction part does not change when you do these operations:
inverse (1/x) = 0.6180339887498948....
square (x^2) = 2.6180339887498948...
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This gives us a few methods to derive the number:
Using the inverse:
1/x = x - 1 (as indicated by Bill T)
x = 1 + 1/x
Using the square:
x^2 = x + 1
x = SQRT(x+1)
2007-03-23 08:41:32 · answer #2 · answered by Raymond 7 · 1⤊ 0⤋
If you are referring to Phi, or the golden ratio, you are talking about one of the most interesting numbers known. It is found in nature in different animals and plants, for example, the spiral of a nautilus sea shell is defined by the golden ratio. Also the way leaves are arranged around plant stems, how the sections of a pineapple are situated, how a falcon dives to catch its prey, all of these are related to the ratio 1.618...
Many poeple attribute mystical properties to the number, they also have "found" the ratio in things built by the ancients that really, on closer inspection were not built according to this number.
For a really interesting read, find the book "The Golden Ratio" by Mario Livio.
2007-03-23 08:32:45 · answer #3 · answered by pahinLA 2 · 1⤊ 0⤋
Well, first, I believe you mean Phi (Φ), which is known as the Golden Ratio. Phi is indeed an irrational and never-ending number like Pi. The number is:
1.618033989
2007-03-23 08:07:00 · answer #4 · answered by Bhajun Singh 4 · 0⤊ 0⤋
I presume you mean the Golden Ratio or 1.6180339887
See the link below for more details
2007-03-23 08:07:32 · answer #5 · answered by dudara 4 · 0⤊ 0⤋
It is a constant . This times of diameter of the circle is the circumference of the circle. My maths teacher explained how the value of pie was arrived. Now I have forgotten the method how he arrived. But the real value is 22 divided by 7 .
2007-03-23 08:16:43 · answer #6 · answered by A.Ganapathy India 7 · 0⤊ 4⤋
pi (pie) is a number and it is 3.14159 26535 to 10 decimal places.
2007-03-23 08:06:50 · answer #7 · answered by Anonymous · 1⤊ 4⤋