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**PI**

The number **Pi**, denoted by the Greek letter **π** - pronounced '**pie**', is one of the most common constants in all of mathematics. It is the circumference of any circle, divided by its diameter. Nobody knows its exact value, because no matter how many digits you calculate it to, the number never ends. For most practical uses, you can assume it is 3.142.

Some people have written computer programs and calculated it to an astonishing accuracy. For example some have calculated pi to 200 million digits.

A Brief History of Pi (π)1900–1680 BC) indicates a value of 3.125 for **π**, which is a closer approximation. The Rhind Papyrus (ca.1650 BC) gives us insight into the mathematics of ancient Egypt. The Egyptians calculated the area of a circle by a formula that gave the approximate value of 3.1605 for **π**.

**Examples** of **Pi**. According to the definition, **Pi** = Circumference/Diameter which is shown in the figure i.e. **π** = C/d, where C is the circumference of the circle and d is its diameter.

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