# What is number pi () and how is it related to area of a circle?

Pi () is a constant used to calculate area of a circle. Pi () is an irrational number. In other words, pi () is ratio of two numbers and a non terminating, non repeating decimal number. Its value is 3.14 (rounded to two decimal places).

Pi is a Greek letter and use to represent the constant (fixed number) used in the formula for area of a circle.

There is a long research to find the exact value of pi and numerous mathematicians have worked to find its exact value

If anybody wants to learn about the circumference or area of a circle, he have to know about “pi ()” as it is used in circle geometry to calculate its circumference and area.

## The definition of pi ()

Pi is defined as the ratio of circle’s circumference to its diameter.

In other words, if there is a circle and we can easily measure its circumference and the diameter, divide these numbers to get pi ().

### Numerical value of pi ()

The value of pi remains constant because the ratio of circumference of a circle to its diameter is always fixed, independent of the size of a circle. The numerical value of pi is equal to 3.14, rounded to two decimal places. You can learn more about pi in depth at this encyclopedia page.

 How to measure pi () As said earlier pi is the ratio of circumference to the diameter of a circle, below is an easy explanation to find the value of pi using a given circle. Remember, you can use pi to find the circumference and the area of the circle, algebraically. Hence the brief introduction with Pi, a constant used to find the area of a circle. The next step is to explore lessons and worksheets on circle geometry, how to find the circumference and area of a circle and its applications in geometry.