From Numberphile: “How accurately can we calculate Pi using hundreds of REAL pies? This video features Matt Parker, who believes this is the world’s most accurate pie-based Pi calculation.”
Pi Day is coming soon. Maybe you’d like to try a pi project with your family? Check out my Pi Day Roundup of links.
Denise Gaskins' Let's Play Math 
If I can add to list of fun Pi Day activities…please check out the Six Million Digits of Pi Poster, along with the magnifier needed to view the millions of microscopic pi digits. No other poster has nearly as many digits and is as much fun to explore.
http://www.exatextposters.com/Six-Million-Pi-Digits-Poster-p/post-m-01.htm