March 14 when written as 3.14 in date notation looks the mathematical constant pi (π), the ratio of a circle's circumference (distance around the edge of a circle) to its diameter (straight line across a circle through its center).

Due to this similarity, the U.S. House of Representatives in 2009 passed a resolution declaring March 14 "National Pi Day". The first celebrations were held in 1988.

image: storify.com

**Websites with more information:**

**9 Amazing Pie Charts in Honor of National Pi Day** (Washington Post)

**Celebrate Pi Day: Seven Classroom Resources for Pi Learning** (Edutopia)

**How America Celebrates Pi Day** (CNN)

**Pi Day - Celebrate Mathematics on March 14** (Piday.org)

**Pi Day Turns 25: Why We Celebrate An Irrational Number** (National Geographic) - Though the article was written in 2013, the information about pi is very relevant.

image: guardianlv.com

Text: NF

These are a few of the books and e-books related to mathematics accessible to LWLC patrons (text & selections: NF):

- Foundations of Mathematical and Computational Economics byCall Number: Springer E-booksPublication Date: 2011
- A Guide to Mathematics Leadership byCall Number: Main Stacks (4th floor) QA 11.2 .B34 2010Publication Date: 2010
- Helping Children Learn Mathematics byCall Number: Main Stacks (4th floor) QA 135.6 .H45 2009Publication Date: 2008
- Knowing and Teaching Elementary Mathematics byCall Number: EBSCO eBook CollectionPublication Date: 2010
- Math Basics for Healthcare Professionals byCall Number: Main Stacks (5th floor) R 853 .M3 B46 2014Publication Date: 2014