Apple Pi

c/d=π
   That's right! The infinitely precise number.
   The equation above is the formula for pi for c=circumference of a circle and d=diameter of the same circle. No matter what size the circle is, the equation always works. The symbol π representing the irrational number was familiarized by mathematician Leonhard Euler in the 18th century. Because the number is an infinitely long decimal that doesn't repeat or continue in any pattern, everyday people use the acceptable approximation of 22/7 or 3.14.
    There are hints that the Egyptians understood pi when they tried to calculate the area of a circle. Also, the Babylonians seemed to "discover" an inaccurate numeral to represent pi. Ancient mathematician Archimedes knew he couldn't find the exact quantity of pi, but he found two numbers that pi was between. In addition, Zu Chongzhi, a Chinese mathematician, used a similar strategy. Unfortunately, his method is unknown.

3.141592653589793238462643383279502884197169399375105820974944592307816406286 208998628034825342117067982148086513282306647093844609550582231725359408128481 117450284102701938521105559644622948954930381964428810975665933446128475648...

Did you know?

"Pi Day" is celebrated on March 14. Albert Einstein was born on this day.