**Pi Day**is celebrated on March 14th (3/14) around the world.

**Pi**(Greek letter “π”) is the symbol used in mathematics to represent a constant — the ratio of the circumference of a circle to its diameter — which is approximately 3.14159.

Also to know is, what is Pi Day and why do we celebrate it?

Pi Day is an annual celebration of the mathematical constant π (pi). Pi Day is observed on

**March 14**(3/14 in the month/day format) since 3, 1, and 4 are the first three significant digits of π.Why is it important to celebrate Pi Day?

The concept of

**pi**is**important**to mathematics because of its relationship to the circle; it is a constant representing the ratio of a circle's circumference to its diameter.Why is Pi Day in 2015 so special?

It's a most auspicious holiday for math lovers. Saturday, March 14,

**2015**is**Pi Day**, a celebration of the irrational number that describes the ratio of a circle's diameter to its circumference.**Pi**is approximately 3.141592653, but it continues at random to infinity.