CHICOPEE, Mass. (WWLP) - Friday is National Pi Day, which recognizes the mathematical constant π, also known as pi. The Roost in Northampton closes its doors this weekend The first three digits of pi are 3.14, which is March 14th, celebrated by pi enthusiasts and pie lovers, according to the National Day Calendar. Pi is the ratio between the circumference of a circle and its diameter and has been used by Egyptians and Babylonians to build since 2000 BC. Mathematicians like Archimedes, Fibonacci, François Viète, Adriaan van Roomen, and Gottfried Wilhelm Leibniz all calculated pi using different methods. In 1706, Welsh mathematician William Jones introduced the Greek letter π to represent the ratio of a circle’s circumference; pi.  There are a few ways you can observe National Pi Day, such as seeing how many numbers you can remember, watching the Life of Pi, or eating a slice of pie. Yelp has put together a list of the best places to get a slice of pie in western Massachusetts. Florence Pie Bar– 17 Main Street, Florence Chmura’s Bakery– 14 Pulaski Street, Springfield Tart Baking Co– 192 Main Street, Northampton Atkins Farm– 1150 West Street, Amherst Small Oven– 36 Union Street, Easthampton Williamsburg General Store– 12 Main Street, Williamsburg Barstows Dairy Store & Bakery– 172 Hockanum Road, Hadley Rice Fruit Farm– 757 Main Street, Wilbraham Randall’s Farm– 631 Center Street, Ludlow Union Street Bistro and Bakery– 35 Union Street, Easthampton Local News Headlines Victim in North Adams fatal fire identified Mayor Garcia to represent Holyoke in Ireland I-91 South exit 9 to I-391 North closed beginning Monday for bridge shielding work Baystate Health confirms sterilization issue at Baystate Wing Hospital WWLP-22News, an NBC affiliate, began broadcasting in March 1953 to provide local news, network, syndicated, and local programming to western Massachusetts. Watch the 22News Digital Edition weekdays at 4 p.m. on WWLP.com. ...read more read less