March 14 is Pi Day in the United States, and some businesses in Norwalk celebrated the day with pie.

Pi Day celebrates the number Pi, 3.14, which is the ratio of a circle's circumference to its diameter.

Michele Stuart, owner of Michele's Pies, says their biggest order on Wednesday was over 200 pies for a local business.

At Trumbull's Fairchild-Nichols Library, kids colored their own Pi and calculated circumference with M&Ms to make math more fun.