Add Yahoo as a preferred source to see more of our stories on Google. Saturday's Google Doodle shows how the mathematical constant pi is useful for easily calculating the area of a circle, the formula ...

Pi Day 2026: March 14 is celebrated every year as Pi Day to commemorate the Mathematical constant Pi. The day also marks the birth anniversary of physicist Albert Einstein and is observed as a ...

Some numbers are useful. Some are famous. And then there is pi, a number so absurdly powerful that humanity has spent thousands of years trying to tame it, failed completely, and then decided to ...