What is Pi?

\pi π is a fundamental constant in mathematics, especially in geometry, trigonometry, and calculus. The first 10 digits of \pi π (sometimes written as "pi" and pronounced as "pie") are 3.141592653... 3.141592653..., but any finite list of digits is an approximation of \pi π.

Why is Pi irrational?

Pi, in mathematics, the ratio of the circumference of a circle to its diameter. Because pi is irrational (not equal to the ratio of any two whole numbers), its digits do not repeat, and an approximation such as 3.14 or 22/7 is often used for everyday calculations.

How do you write Pi Pi?

Draw a circle with a diameter (all the way across the circle) of 1 Then the circumference (all the way around the circle) is 3.14159265... a number known as Pi Pi (pronounced like "pie") is often written using the greek symbol π of a Circle.

How does Pi relate circumference and diameter?

Pi not only relates circumference and diameter. Amazingly, it also connects the diameter or radius of a circle with the area of that circle by the formula: the area is equal to pi times the radius squared. Additionally, pi shows up often unexpectedly in many mathematical situations. For example, the sum of the infinite series