I said this to my Algebra Teacher once, she did not get it. That's okay, I didn't get Algebra either. My Geometry teacher had a far better sense of humor. Algebra never make sense until after I took Geometry any way.
Today is Pi Day, for obvious reasons. Pi is a Greek letter representing the ratio of a circle's circumference to its diameter, a mathematical constant. If a circle's diameter is one, its circumference is approximately Happy Pi day.