The Significance of 3.14: Celebrating Pi Day

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3.14 is a familiar number for many of us. We call it “Pi”, which is represented by the Greek letter “π”. It is basically the ratio of the circumference of a circle to its diameter.

But why are we talking about Pi here? Because it’s Pi Day today.

14th March is celebrated as Pi Day around the world and we have every reason to celebrate as well. We already know how Pi is extensively used in various formulae.

Pi is usually approximated to 3.14 and used as a constant in most calculations. However, Pi is an irrational number and is also written as 22/7 which gives an infinite, non-repeating decimal of 3.141592…

It is quite unusual for anyone to use more than the first three digits of Pi, but a man in China holds the Guinness World Record for memorizing the most number of digits in Pi. He recited the digits in memory upto 67,890 places in 2005.

The application of Pi is seen in several areas like Geometry, Science, Trigonometry, Nature etc.


A good number of discoveries in science included the usage of Pi. Today Pi is used in sciences such as statistics, fractals, thermodynamics, mechanics, cosmology, number theory, and electromagnetism.

It is also used to measure how fast and powerful a computer is by checking its accuracy and the status of the software or hardware.


Pi is used in trigonometry to understand basic functions like sine, cosine, tangent, etc. In a more complex case, it is used to measure the circular velocity of things like truck wheels, motor shafts, engine parts and gears. It also measures the AC voltage across a coil and a capacitor.

There is also a filter that does not allow high frequency but lets low frequency in, it’s called the Pi filter.


Pi is used to measure natural occurrences like ocean waves, light waves, sound waves, river bends, radioactive particle distribution etc.

While the usage of Pi is limited in simple everyday calculations, it is a number with a very significant presence in the world of research and discovery.

Let’s celebrate 3.14 today with a slice of pie.