# The infinite life of pi

- Institution: TED
- Department: TED-Ed
- Speaker: Reynaldo Lopes
- Year: 2013
- Level: For everyone
- Language: English
- Subjects: Mathematics
- Source: [TED](https://www.ted.com/talks/reynaldo_lopes_the_infinite_life_of_pi)
- Licence: [CC BY-NC-ND 4.0](https://creativecommons.org/licenses/by-nc-nd/4.0/) (Non-commercial use only, and no changed versions.)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

The ratio of a circle's circumference to its diameter is always the same: 3.14159... and on and on (literally!) forever. This irrational number, pi, has an infinite number of digits, so we'll never figure out its exact value no matter how close we seem to get. Reynaldo Lopes explains pi's vast applications to the study of music, financial models, and even the density of the universe. \[Directed by Igor Coric, narrated by Addison Anderson\].

## Lectures

1. [The infinite life of pi](https://invisiblenetwork.ai/learn/ted/reynaldo_lopes_the_infinite_life_of_pi/170ddd0c1c9c), 4 min (TED's player)