TT (often written pi) is a mathematical constant whose value is the ratio between circumference and diameter of any circle in a Euclidean space, is the same value as the ratio of area of a circle and square of its radius.
pi=2*pi*R/2*R, where 2*pi*R=circumference of any circle and 2*R=D=diameter of any circle.
The symbol "pi" was first proposed by Welsh mathematician William Jones, in 1706. Constant value is equal to approximately 3.14159, in an ordinary decimal notation.
Pi is one of the most important constants in mathematics and physics: many formula of mathematics, engineering and other sciences involving pi.
Since pi is an irrational number, it has an infinite number of decimals that do not contain sequences that are repeated. The infinite string of digits has fascinated mathematicians and many have made significant efforts over the past several centuries to calculate decimal places and to investigate properties of this number. Despite the analytical work and calculations performed on supercomputers have calculated 10 thousand billion digits of π, there appeared no identifiable pattern in the digits found.
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