*Pi Day celebrates the mathematical constant pi, which represents the ratio of a circle’s circumference to its diameter. It’s observed on March 14th every year.*

Naveen is sitting in the classroom and waiting for the math teacher, whose lecture is about to start. He is a math enthusiast and studies in Class 9. He just got the news that** March 14th is celebrated as Pi Day to honour the mathematical constant pi (π). **And he and his classmate, Aisha, made a plan to ask the math teacher about Pi Day.

The students stand up as the math teacher enters the classroom. They greet him with a chorus of “Good evening, sir.” He smiles and gestures for them to sit, his eyes scanning the room. As he prepares to begin his lecture, Naveen raises his hand.

The teacher nods and says, “Yes, Naveen.”.

Naveen: It’s Pi Day on March 14th, and we are interested to know about it, so could you please tell us about Pi Day?

The teacher: Yes, of course. I’m glad you are aware of Pi Day. So, what do you want to know?

Naveen: We’d like to learn everything about this day.

The teacher: okay. So, let’s start with some basic questions. What is Pi?

Navin’s classmate, Aisha, raises her hand. The teacher nods at her to answer.

Aisha: In math, pi shows a relationship between a circle’s size and its curved edge. It’s a mathematical constant representing the ratio of a circle’s circumference to its diameter.

The teacher: Good. So, pi is a special number in math. No matter how big or small the circle is, the circle’s circumference and its diameter always have a ratio of around 3.14. For a long time, people have been trying to calculate as many digits of pi as possible. Before the computers, this calculation was done by hand, and they only reached a few hundred digits.

After the invention of computers, we can now calculate trillions of digits. In 2019, a Google developer named Emma Haruka Lwao set a record by calculating pi to 31 trillion digits,** and the record for memorizing pi is held by Suresh Kumar from India.** In 2015, he memorized and recited an incredible 70030 digits of pi in over 17 hours and 14 minutes.

Naveen: But, sir, who found the pi, and what is the history behind it?

The teacher: Pi was first used by mathematician William Jones in 1706, and he chose” the word “perimeter” of circles. Later on, a famous mathematician, Leonhard Euler, made the symbol π more popular in 1737.

Aisha: But why 14 March for Pi Day?

Naveen: There is an interesting thing about its date. So, Pi Day is celebrated on March 14, which means 3.14. See the first three digits of the number pi. It’s 3, 1, and 4. The same number helps us understand the circle, which is the value of Pi. But the thing is, pi goes on forever without repeating; we often use 3.14 as an approximate value.

**The idea to celebrate Pi Day on March 14th was proposed** by physicist Larry Shaw. The date and time of the celebration are 1:59 pm. This time was chosen because, when you combine the date and time, it becomes 3.14159, which approximates the value of pi. So, it’s a fun way to celebrate math, and it’s important in our lives.

Teacher: Very Good Naveen

Another student raises their hand and asks “Sir but how to celebrate this day?

Teacher: Pi Day was officially recognized in 2009. people celebrate Pi Day by eating circular treats fruit pies and pizza. The interesting thing is that the 14th of March is also Albert Einstein’s birthday so people also dress up like Albert Einstein on this day. People play mathematical games to honour the importance of pi in mathematics.

Naveen: sir, can we celebrate Pi Day on 14th March?

The teacher: Yes, we can celebrate it. I’ll talk with the principal about it. For now, Let’s start today’s lecture.

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## FAQ

### 1. **What is Pi Day?**

Pi Day is celebrated to honour the mathematical constant pi (π), which represents the ratio of a circle’s circumference to its diameter.

**2. When is Pi Day celebrated?**

Pi Day is celebrated on March 14th each year.

### 3. **Why is Pi Day celebrated on March 14th?**

It’s celebrated on March 14th because the date (3/14) represents the first three digits of the value of Pi(3.14).

### 4. what was the name of the famous mathematician who made it popular and in which year he introduced it?

A famous mathematician, Leonhard Euler, made the symbol π more popular in 1737.