Happy [3.141592653589793238462643383279…] Day

### The Number Pi*

Pi represents the relationship between a circle’s

diameter(its width) and itscircumference(the distance around the circle).## Equations that use Pi

The

area of a circleis calculated using Pi and the radius of the circle. This formula inspired the joke “Pies aren’t square, they’re round!”To find the volume of a rectangular prism you calculate length × width × height. In that case, length × width is the area of one side, which is then multiplied by the height of the prism. Similarly, to find the

volume of a cylinder, you multiply the area of the base (the area of the circle, which is pi × r²), then multiply that by the height of the cylinder.

* completely plagiarized from “http://www.piday.org/learn.php”

That pie looks incredibly awesome. Happy Pi Day!