Did you know that March 14th is “π day”? The Greek letter π is pronounced ‘pie’, or sometimes written out in letters as ‘pi’. π is the symbol used to represent the special number that is calculated when comparing a circle’s circumference to its diameter. This number’s value is close to, but not exactly, 3.14. If you take a string and wrap it around something circular, you’ll find that the length of that string is about three times longer than the width of the circle. You’ll find this works, no matter how large or small the circle!
We hope that you have a well-rounded day today! Remember to think kind thoughts, use kind words, and do kind things. We Love You.
The symbol π was used to represent this mathematical constant around the mid 1700’s. It is derived from the Greek word ‘perimetros’, which means circumference.
Sometimes π is called “Archimedes’ Constant”. Archimedes used nestled polygons to approximate the value of π. His calculated value is close to 22 divided by 7.
Many ancient civilizations approximated the value for π. Chinese mathematicians calculated a value accurate to seven decimal places. Ancient Egyptians used the approximation of 22 divided by 7. In 1873, William Shanks manually calculated 527 digits of π. Currently, programmers and mathematicians have used computers to calculate π to 22.4 trillion digits.
Since π is closely related to the circle, this ‘number’ and symbol appears in formulas in geometry, trigonometry, physics. It is also used in statistics, number theory, and more.