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 symbol used by mathematicians to represent the ratio of a circle's circumference to its diameter is the lowercase Greek letter π, sometimes spelled out as pi. [1] In English, π is …

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 …

Jun 20, 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 …

May 17, 1999 · Succinctly, pi—which is written as the Greek letter for p, or π—is the ratio of the circumference of any circle to the diameter of that circle. Regardless of the circle's size, this …

Discover what pi (π) is and why it matters in math. Learn how it's used to calculate circumference, area, radians, and more. Simple explanations with examples.

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. It …

The Pi symbol, derived from the Greek letter "π" (pi), is one of the most recognized mathematical symbols worldwide. It represents both a letter in the Greek alphabet and a fundamental …

Defined as the ratio of a circle’s circumference to its diameter, pi is an irrational number, meaning it cannot be expressed as a simple fraction and its decimal representation is non-terminating …

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.