Pi Day is an annual celebration held on March 14th to commemorate the mathematical constant π (pi). Pi is an irrational number that represents the ratio of a circle's circumference to its diameter and is commonly approximated as 3.14. Pi Day is celebrated by mathematicians and math teachers around the world, who participate in activities and events centered around the significance of pi. The date March 14th was chosen for Pi Day because it corresponds to the first three digits of pi (3.14).

Pi Day is a great opportunity for teachers to introduce their students to the world of mathematics. By celebrating Pi Day, teachers can help students understand the significance of pi and how it is used in various mathematical calculations.

Participating in Pi Day activities and events can help students develop an appreciation for the beauty of math. It also provides a great reason to feast on pie at school.

Here are some Pi Day educational resources.

• 37 Mathtastic Pi Day Activities for the Classroom
• Activities for Pi Day - poems, necklaces, “Pi” plates, and more.
• Celebrate Pi Day with NCTM - resources for elementary, middle, and high school.
• Pi Day activities from Exploratorium.
• 7 Classroom Resources for Pi Day
• Ten Ways to Celebrate Pi Day - Get ready for a Pi day workout.
• 21 Pi Day Resources for Your Classroom

Here are some of the ways Pi is used.

• Calculating the area and circumference of circles
• Finding the volume and surface area of spheres
• Calculating the period of oscillation of a pendulum
• Analyzing sound waves and other wave phenomena
• Modeling the behavior of fluids
• Determining the distance between two points on a sphere
• Calculating the length of a curve
• Analyzing chaotic systems
• Calculating probabilities for random events
• Determining the frequency of a wave