MATH
'(<a href="http://www.j-archive.com/media/2007-04-03_DJ_29.jpg" target="_blank">Jon of the Clue Crew demonstrates with a beach ball & a diagram on the monitor.</a>)  To find the circumference of a beach ball, use the equation 2 pi r to figure out it's this many inches'
about 31 inches (10 x pi)