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…

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

Nov 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 …

Pi 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 …

The greek small letter π (pi) is a geometric constant approximately equal to 3.1416. The numeric value is equal to the length of any circle's circumference divided by its diameter.

Learn about the number pi, why it is important in math, and what it is used to calculate!

All things about Pi (π).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 …