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March 14 party pack

Pi Day Trivia

Twenty ready-to-use Pi Day trivia questions — perfect for classroom contests, Zoom parties, pub quizzes and math clubs. Answers are below each question so you can cover and reveal.

Easy (warm-up)

  1. Q: What is the first digit after the decimal point in pi?
    A: 1 (so pi starts 3.1…).
  2. Q: On what date is Pi Day celebrated?
    A: March 14 (3/14).
  3. Q: Who is also famously born on Pi Day?
    A: Albert Einstein (born March 14, 1879).
  4. Q: What does pi represent?
    A: The ratio of a circle's circumference to its diameter.
  5. Q: How many digits of pi are usually used for everyday calculations?
    A: Two or three (3.14 or 3.14159).

Medium

  1. Q: To seven decimal places, what is pi?
    A: 3.1415926
  2. Q: Who first used the Greek letter π for this ratio?
    A: William Jones, in 1706.
  3. Q: What type of number is pi: rational or irrational?
    A: Irrational.
  4. Q: Who invented Pi Day, and where?
    A: Physicist Larry Shaw, at the Exploratorium in San Francisco, in 1988.
  5. Q: What geometric formula uses pi to compute the area of a circle?
    A: A = πr².
  6. Q: What's a "piem"?
    A: A poem where the letter count of each word spells out the digits of pi.
  7. Q: How many digits of pi does NASA use for interplanetary navigation?
    A: 15.

Hard

  1. Q: What is the Feynman point, and where is it?
    A: Six 9s in a row, starting at position 762 of pi.
  2. Q: Who proved pi is transcendental, and in what year?
    A: Ferdinand von Lindemann, in 1882.
  3. Q: To how many digits did Ludolph van Ceulen famously compute pi?
    A: 35 digits (they're on his tombstone).
  4. Q: Which formula converges on pi at 14 digits per term and is used in most record computations?
    A: The Chudnovsky formula.
  5. Q: What famous equation ties together e, i, π, 0 and 1?
    A: Euler's identity: e^(iπ) + 1 = 0.
  6. Q: In 1897, what was the almost-passed "Indiana Pi Bill" trying to do?
    A: Legally redefine pi as 3.2 (based on a flawed proof).
  7. Q: To how many digits of pi was the computed record taken in 2024?
    A: Over 200 trillion digits.
  8. Q: The Basel problem — sum of 1/n² — equals what?
    A: π²/6.

Want to play a live game?

Try the interactive Pi Quiz, which scores you automatically, or Pi — The Game for a memorization challenge.