What is "Pi "?
Pi is a constant used in mathematics and physics, denoted by the
Greek letter
Numerically it is the value that is obtained by dividing the
length of a circle to its diameter.
CIRCUMFERENCEDIAMETER
Its value is: 3.14159 26535
Short story
The history of the greek Pi has about 4000 years. It was the
Babylonians, mathematicians and architects, the first to use it,
interpreting it as 3.125
The Greeks used inscribed polygons (internally tangent) and
limited (externally tangent) in a circle.The length of a
circumference is necessarily comprised between an upper limit which
corresponds to the perimeter of the outer polygon, and a lower one,
which corresponds to the perimeter of the inner polygon.The more
sides a polygon has, the more accurate is its approximation to the
circle, and consequently the greater is the accuracy with which one
can derive the number that binds the circumference to its
diameter.Archimedes used polygons with 96 sides.
In 434 b.C. Anassagora tried to square the circle. Then, in III
b.C. Century, Archimede approximated this number to 3,1419.
Afterwards, a lot of mathematicalists studied this number: Newton,
for example, calculated the first 16 decimal digits, while the
supercomputers calculated approximately 5 trillions of digits.
Even if all the trunks and all the leaves of all the trees in
the world were filled with thousands of digits, the Earths forests
would not be sufficient to represent the pi's digits.
But what really the Pi number is for?We might think that it is
rather a mathematical phenomenon, a kind of monster to show in
exhibitions.Yes, its true. Its the relationship between the
circumference and the diamater of a circle, but why should we
care?It could look like a marginal detail of our existence, one
thing to know once for all and then forget.
In our daily life, we need to use it rarely. So why couldnt we
just tell that =3 -as apparently Chuck Norris does- or accept the
Indiana House of Bill n. 246 -dated 1897- that fixed =3,2?Wouldnt
our school life be greatly semplified?
The problem is much more complex.Simply, it is not an irrelevant
mathematic curiosity on the edge of our daily lifes, but it is, on
the contrary, an integral part of it. A mistake in its calculation
could have disastrous consequences.
Every time a rope or a wave vibrate -an electromagnetic wave,
such as the sound of a musical instrument- or even when something
spreads for example the temperature in a metal bar, or a scent in
the air, or the seasonal flu- is there to govern their
oscillations, the timbre of that particular physical
phenomenon.
In fact, the natural frequencies of oscillation are always
governed by periodic functions (sines and cosines) that involve
Pigreco.A mistake in the calculation of a resonance frequency of a
bridge can also contribute to make it fall down.
And thats not all
You have to use if you are interested in finance, medicine,
demography or industrial quality.
In fact, the Gaussianian, that has such important role in
statistics and consequently in all natural and social sciences,
depends in a decisive way by .
CURIOSITIES
The height of an elephant from the ground to its shoulder can be
determined by multiplying by 2 the diameter of one of its paws.
The "PI DAY" is a celebration day in honor of this constant. It
takes place on March 14 with celebrations around the world
(festivals, sweets, t-shirts, games and more in general a tono that
has to do in some way greek Pi). Last year it was March 14, 2015,
and in Anglo-Saxon countries the date indicates the month and then
the day, therefore the party was even more impressive, because 3 14
and 15 are exactly the first 5 digits of the constant. An article
about this event was voluntarily published by 9:26 and 53 seconds,
by matching the first 10 digits of Pi greek.
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