A to F   G to M   N to T   U to Z   See also: - Circles - Irrational Numbers Maths Pi  = 3.141592653...   Pi is the ratio of the circumference of a circle to its diameter. Pi is an absolute constant and also an irrational number similar to e and 2 - in other words, it cannot be expressed as the ratio of two integer (or whole) numbers. The letter   (the Greek letter pi) was first used by Leonhard Euler.   The easiest way to determine pi is to take a regular polyhedron with many sides (the circumference of which can be easily calculated) and divide the circumference by the diameter. This will give an approximation to pi. An exact value can theoretically be determined by using a regular polyhedron with an infinite number of sides - a circle.

Top [ H O M E ] [ S C I E N C E ] [ M A T H S ] [ A S T R O N O M Y ] [ S E A R C H ] [ A to F ] [ G to M ] [ N to T ] [ U to Z ]   © 1997 - 1999, Jonathan Stott