Pi Day was first formally celebrated in 1988 at the San Francisco Exploratorium, when staff physicist Larry Shaw organized events around March 14, or 3/14, aka 3.14, which are the first three digits of pi (π), the mathematical constant that is the ratio of a circle's circumference to its diameter. In 2009, the U.S. House of Representatives recognized it as an annual event, and since then, much like pi itself, has become a source of infinite joy.
These Pi Day lessons and activities are perfect for teaching your students about trigonometry, geometry, physics, cosmology, statistics, thermodynamics, and much more as pi appears in numerous formulae. So help yourself to a slice of pi here and enjoy!
