Pi, Greek letter (), is the symbol for the ratio of the circumference of a circle to its diameter.  The area of a circle is calculated using Pi and the radius of the circle.

In honor of this perfect proportion, math enthusiasts around the world celebrate Pi Day on March 14th. Pi = 3.1415926535…

Multiple ancient civilizations including Egypt, Greece and Iron-Age India have stunning examples of the use of Pi; think “Great Pyramids” and you get the idea.

Perhaps it’s belaboring the point, but it seems an interesting coincidence that the “Ides of March” follow so quickly on Pi’s heels.  Ides comes from the Latin word idus, meaning half division.

Julias Caesar was warned to “Beware the Ides of March”, and when the date arrived his fate shifted dramatically.  But most of us can just take pleasure in the perfection of proportion and seeming infinity.