ELI5: Explain Like I'm 5

Buffon's noodle

Okay kiddo, so Buffon's noodle is a funny name for a math problem about circles and squares. Imagine you have a square on the ground, and you want to know if a round noodle will fit inside it.

To figure it out, Buffon (who was a smart guy who liked math) said we could pretend the noodle is really a straight line. If we drop it on the square, we can see where it crosses the lines of the square.

Now it gets tricky. Buffon said we should pretend we have lots and lots of noodles (or lines), and we can drop them randomly on the square. Some of them will cross the lines of the square, and some won't.

But if we keep dropping noodles, eventually we'll be able to count how many cross the lines of the square. And if we divide that number by the total number of noodles we dropped, we can figure out the chances that a noodle will cross the lines of the square.

And that number tells us something really cool: it helps us figure out the value of a very important number called pi! So, in a fun way, Buffon's noodle is just a way to help us understand circles and squares, and how they're related to pi.