The volume and surface area of a ball are about 1/2 that of the box it came in. This comes in handy for back-of-the-envelope calculations. Source: http://www.

The volume and surface area of a ball are about 1/2 that of the box it came in. This comes in handy for back-of-the-envelope calculations. Source: http://www.vendian.org/envelope/dir0/ballbox.html http://www.vendian.org/envelope/dir0/ballbox.html