Pi (π) is a mathematical constant. It is defined as the ratio of a circle’s circumference to its diameter.
It doesn’t matter how big or small the circle is, the ratio stays the same.
Apart from being used to find the area and circumference of a circle, pi is used in most calculations for construction, communications, music theory, medical procedures, air travel, and space flight, just to name a few.
From the formula to calculate the circumference of a circle;
![How to Calculate Pi.](https://www.learntocalculate.com/wp-content/uploads/2020/05/circumference..png)
Circumference (C) is the distance around the edge of a circle or any circular shape.
A diameter (d) is the longest chord of a circle that passes through the center of the circle and whose endpoints lie on the circle’s circumference.
We get;
![How to Calculate Pi.](https://www.learntocalculate.com/wp-content/uploads/2020/05/pi-2-2.png)
Example:
A circle has a circumference of 44 cm, its diameter is 14 cm. Calculate for pi.
![How to Calculate Pi.](https://www.learntocalculate.com/wp-content/uploads/2020/05/pi-3.png)
Therefore, from the above example, the value of pi is 3.14 rounded off to the nearest two decimal places.