Pi Day

Students at The Evergreen School in Shoreline, Wash. hold up nearly 5,000 digits of the number Pi, each digit written on a link of a paper chain, during the 22nd annual Pi Day today. Pi is the number that expresses the ratio of a circle’s circumference to its diameter. Though it’s a number with no endpoint, its digits start with 3.14. (AP Photo/Seattlepi.com, Joshua Trujillo)

Question: Are you good at higher math?