a minor arc is less than half the circumference. Image caption, The diameter is the whole distance across the circle, through its centre. The diameter is two radii. The radius is half of the diameter.

WEST PALM BEACH, Fla. (AP) — Math enthusiasts around the world, from college students to rocket scientists, celebrate Pi Day, which is March 14 or 3/14 — the first three digits of an infinite number ...

Around 250 B.C., the Greek mathematician Archimedes calculated the ratio of a circle's circumference to its diameter. A precise determination of pi, as we know this ratio today, had long been of ...

Originally defined as the ratio between the circumference of a circle and its diameter, pi — written as the Greek letter π — ...

This day honors the mathematical constant 3.14, which represents the ratio of a circle's circumference to its diameter. Congress averts government shutdown after Senate passes spending bill How ...

Each year, on March 14, it's become traditional for numerophiles and mathematicians to pause and reflect on the most famous of irrational numbers, pi.

If you remember from school, Pi is the ratio of a circle's circumference to its diameter. It is a number that is usually written as 3.14. Around Pi Day, or March 14, you know 3-1-4. We have shown ...

Building the full value of pi has been a project thousands of years in the making, but just how much of this infinite number do we actually need, asks our maths columnist Jacob Aron ...