For at least 3,000 years.
'pi' is the small case Classical Greek letter 'p', and means 'proportion'.
The Sumerian civilisation is thought to have calculated it.
They noticed that when a donkey is tethered to a pole to drive up water, it went round in a circle. The distance around the circle(circumference) was greater , the longer the tether was made (radius).
From this they deduced that the circumference was directly proportional to the diameter * 2 radii).
In algebraic terms
C is directly proportional to d
Equating
C = d * k ( k is a constant)
Hence dividing by 'd'
k = C/d
K was found to be always 3.141592.... and was given the name 'pi' , for proportion.
Hence today we use C = pid or C = 2pi*r
If you are learning about this in school , you will probably be given pi = 3.14, but this is only an approximation. A closer approximation is pi = 3.1416
However, 'pi' is an IRRATIONAL number, which casually means, the decimals go to infinity and are not in any regular order. Supa Dupa computers have calculated 'pi' to billions of places and still going.
A Classical Greek mathematician , Eratosthenes, in approximately 220 BC and using 'pi' calculated the Earth's circumference to a very high degree of accuracy. It took Christopher Columbus 1600 more years to actually prove the point.
Since around 2000 BC. Even though it was only right to the first decimal.
An irrational number has no end and pi is infinite and has no end, therefore pi is irrational. Note: There are computers that have been computing the number pi for a long time and there has been no end yet. The numbers just keep going on and on and there is no rhyme reason or pattern to it.
1.2411 trillion digits (1,241,100,000,000) digits of pi have been dicovered.
cause pi is allways around us and without it we would probley die
Circumference of a circle = 2*pi*radius or pi*diameter
pi has been around for as long as we have had written records.Its approximate estimated value of Pi up to 5 decimal places is 3.14159 .Archimedes was the first person to estimate the correct value of pi
Pi have been studied for over 10 centuries!!!
Since around 2000 BC. Even though it was only right to the first decimal.
No. Pi has been around for much longer. There's even a reference to it in the Bible.
An irrational number has no end and pi is infinite and has no end, therefore pi is irrational. Note: There are computers that have been computing the number pi for a long time and there has been no end yet. The numbers just keep going on and on and there is no rhyme reason or pattern to it.
how long has deforestation been around
As long as guns have been around.
Pi has been calculated to over two trillion decimal places. I won't live long enough to type all of them.
Pi has been calculated to over 1 trillion places, but it has an infinite number of places since it's sequence never repeats.
how long has the london eye been around for
As long as So Random has been around.
They have always been around