The circumference of a circle is the distance around the shape. The ability to round a number to a number of decimal places or to a number of significant figures means that answers can be written to ...

Pi, a mathematical constant denoted by the Greek letter π, is the ratio of a circle's circumference C to its diameter d: π = C/d. The circumference of a circle is, in turn, equal to 2πr, where r is ...

Beth Py-Lieberman - Author, The Object at Hand: Intriguing and Inspiring Stories from the Smithsonian Collections Every year, the celebration of Pi Day (March 14 is 3.14) grows more ambitious. Math ...

When Isaac Newton computed pi to 15 decimal places in the 17th century, he wrote, “I am ashamed to tell you to how many figures I carried these computations, having no other business at the time.” The ...

Ever since he blew our minds hosting Cosmos: A Spacetime Odyssey, Neil deGrasse Tyson has been basically our favorite astrophysicist ever. He helps us better understand where we all came from with ...

On Pi Day (March 14) we celebrate perhaps the most iconic irrational number on Earth. From its ancient origins to the unanswered questions, here are some of the most surprising facts about pi. When ...