Friday Mar 15 2013 comments National Pi Day at E.V. Cain By: Andrew Westrope, Staff Writer -A +A Buy This Photo Now From left, math teacher Stacy James helps Jose Saravia, 13, and Jonathan Montano, 12, measure the circumference of a bike wheel on Thursday at E.V. Cain Charter Middle School in Auburn. In honor of National Pi Day, which comes around every March 14 in honor of the famous geometric ratio (3.14), James’ math classes spent the day studying dimensions and ratios of circular objects. Math teacher Stacy James explains a lesson to seventh grade pre-algebra students at E.V. Cain Charter Middle School on Thursday. In honor of National Pi Day, Safeway of Auburn and Roseville provided 15 pies to reward students learning about the famous geometric ratio, usually approximated to 3.14. Throughout the school day on Thursday, math teacher Stacy James had her students add digits to a paper chain describing the value of pi, the first digits of which are 3.14 and the reason for National Pi Day every March 14. By midday the chain was 87 digits long, and James said it would reach 117 by the time her last class was finished.