Math Limericks!

[yendi]

Because you know the world needed limericks that could neither be told to little kids, nor in bars. Go over to <a href="http://www.trottermath.com/limricks.html>this site</a> for examples like this one: If inside a circle a line Hits the center and goes from spine to spine And the line's length is "d", The circumference will be d times 3.14159.