TED-Ed
Reynaldo Lopes: The infinite life of pi
2013 • E357 Jul 10, 2013 4m
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].