# How pi was almost 6.283185...

Happy pi day! Did you know that in some of his notes, Euler used the symbol pi to represent 6.28..., before the more familiar 3.14... took off as a standard?
Well, people asked, and what better way to celebrate pi day?
The idea for this video, as well as the live shots, came from Ben Hambrecht, with the writing and animating done by Grant Sanderson. And you know the drill with YouTube, if you want to stay posted on new videos, subscribe, and click the bell to receive notifications (if you're into that).

Video tags: missing

Related videos

### The hardest problem on the hardest test

A difficult geometry puzzle with an elegant solution.
Give it a try! In the solutions for that problem, by the way, the that Calvin Lin...

### Riemann's paradox: pi = infinity minus infinity

With the help of a very famous mathematician the Mathologer sets out to show how you can subtract infinity from infinity in a legit way to...

### Calculus at a Fifth Grade Level

The foreign concepts of calculus often make it hard to jump right into learning it. If you ever wanted to dive into the world of mathematics...

### But what is the Fourier Transform? A visual introduction.

An animated introduction to the Fourier Transform, winding graphs around circles.
And you know the drill with YouTube, if you want to stay...

### Euler's Identity

In order to describe the Fourier Transform, we need a language. That language is the language of complex numbers. Complex numbers is a...

### How secure is 256 bit security?

Supplement to the cryptocurrency video: How hard is it to find a 256-bit hash just by guessing and checking? What kind of computer would...

### What does it feel like to invent math?

An exploration of infinite sums, from convergent to divergent, including a brief introduction to the 2-adic metric, all themed on that cycle...

### Why is pi here? And why is it squared? A geometric answer to the Basel problem

A most beautiful proof of the Basel problem, using light.
What about all the lighthouses on the far end? Well, a more careful calculation...