Pi

The first 10 digits of pi (π) are 3.1415926535

The number π (/paɪ/; spelled out as "pi") is a mathematical constant. It is defined in Euclidean geometry 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.
The first 121 digits of pi (π) are: 3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067982148086513282306647

Learn more