Video: History of discovery and application of pi numbers in mathematics

Try measuring a circle, diameter and radius, it's easy to measure, it's just straight lines, you can measure it with a ruler. But to measure a circle, you'll need a measuring tape or a piece of wire, unless it's a better measurement.

Obviously, the circumference of the circle will increase or decrease in proportion to its diameter, but this relationship is further than that.

In fact, the ratio of 2 values, the circumference divided by the diameter is always the same number no matter how big or small the circle is.

Historians are not sure when and how this number was first discovered, but it has been known in some form from about 4000 years ago.

The irrational amount of pi is determined by taking the circumference of any circle divided by its diameter.