Can You Calculate Pi by Drawing a Circle? Take the Pi Day challenge: How many decimal places can you nail with this method? Pi makes the world go round.

Pi can be calculated using a random sample of darts thrown at a square and circle target.

On this day of numerical glory, get to know pi in an unusual way: using the elastic collision of two different masses and a wall.

Celebrate Pi day by finding out just how fast your computer can calculate pi.

Yet even after mathematicians worked out how to calculate pi accurately to over 100 decimal places at the start of the 18th century, we didn’t have an agreed symbol for the number.