Pi, the ratio of a circle's circumference to its diameter, a subject of endless fascination in ancient times and still today. Here it is shown to 250 decimal places (an accuracy not reached till 1855). It has now been calculated to more than 51.5 billion digits.
See something you'd like a bit different? Bulk and custom orders are welcome! Anything else about the shop? Let me know.
Like what you see? Tell your friends!