## What is an interesting fact about pi?

Pi is the most studied number in mathematics, and for good reason. The number pi is integral to our understanding of geometry. Pi has uses in physics, astronomy, and mathematics. Pi is used in architecture and construction as well, and has been a vital part of everything from arches and bridges to the Pyramids of Giza.

**How old is the number pi?**

4000 years

Pi (π) has been known for almost 4000 years—but even if we calculated the number of seconds in those 4000 years and calculated π to that number of places, we would still only be approximating its actual value.

**What’s the formula for pi?**

The formula for the value of pi is the ratio of the circumference of a circle to its diameter. In the ratio form, it is π = Circumference/Diameter.

### How do you get pi math?

In some ways Pi (π) is a really straightforward number – calculating Pi simply involves taking any circle and dividing its circumference by its diameter.

**What do you need to know about Pi?**

Pi π is an irrational constant. Which means, this can not be expressed as a fraction. Pi is denoted by the Greek letter π and is defined as the ratio of the circumference to diameter of a regular circle. In other words, the ratio which is made by the circumference and diameter of a unit radius circle, is 1 pi (π).

**What was the value of Pi in ancient times?**

Here’s a brief history of finding pi. The ancient Babylonians calculated the area of a circle by taking 3 times the square of its radius, which gave a value of pi = 3. One Babylonian tablet (ca. 1900–1680 BC) indicates a value of 3.125 for pi, which is a closer approximation.

#### Why do we have Pi Day in school?

Pi Day provides the perfect excuse for incorporating math and geometry into all aspects of the school day. Pi is the circumference of a circle (the distance around the circle) divided by its diameter (the distance across).

**Who was the first person to calculate pi?**

The first calculation of π was done by Archimedes of Syracuse (287–212 BC), one of the greatest mathematicians of the ancient world.