20 questions — test your knowledge · 17 plays
March 14 is Pi Day — the annual celebration of the mathematical constant pi (3.14159...). From ancient Babylonian clay tablets to Google Cloud supercomputers, humanity has been obsessed with this never-ending, never-repeating number for over 4,000 years. Whether you know pi to 3 digits or 300, this quiz covers everything from the basics of circles to the Chudnovsky algorithm and the Feynman point. How much do you know about the world's most famous irrational number?