The first million digits of pi (π) are below. Why not calculate the circumference of a circle using pi here. Or simply learn about pi here. Maximize the fun you can have this Pi Day by checking out…

The number π (/ p aɪ / ⓘ; spelled out as pi) is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter. It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of ...

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. The definition of π is: of a Circle.

Mar 17, 2025 · Pi, in mathematics, is 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.

The number π is a mathematical constant. It is defined as the ratio of a circle's circumference to its diameter, and it also has various equivalent definitions. It appears in many formulas in all areas of mathematics and physics.

Pi is an irrational number, which means you can’t write it as a simple fraction. Its decimal form goes on forever and never settles into a repeating pattern. No matter how far you go, the digits keep coming. We use the Greek letter π to represent it. Because there’s no way to write pi exactly with numbers, we use the symbol π to stand in ...

Pi (π) (/ paɪ /) is a mathematical constant that is the ratio of a circle 's circumference to its diameter. This produces a number, and that number is always the same. However, the number is rather strange. The number starts as 3.141592653589793... and continues without end. Numbers like this are called irrational numbers. [1][2][3]

Sep 21, 2023 · Pi is a circle's circumference divided by its diameter. (The diameter is twice the radius or double the length from any point on the circle to its center. The circumference is the distance around a circle.)

Mar 17, 2025 · The value of pi is approximately 3.14, or 22/7. Pi is an irrational number , which means it is not equal to the ratio of any two whole numbers. This also means pi can be expressed as an infinite decimal expansion with no regularly repeating digits.

Pi (π) is the ratio of the circumference of a circle to its diameter. The value of pi is 3.14159..., an irrational number. Pi is a constant value. That is, the ratio of the circumference to the diameter is the same for all circles. The drawing below shows the circumference of a circle that has been "straightened out."