math

Every march 14, math becomes as easy as pi(e). It's pi day. pi is the ratio of a circle's circumference (the  distance around the circle) to its diameter  (the distance  straight across its center) . That ratio never changes. The distance around a circle is aways a little over three times the distance  straight across it.   

rounded  to  nearest  hundredth pi  equals 3.14 so the perfect day to celebrate the unchanging  dimensions of a circle is the 14th day of the third month of the year. And the perfect way to  celebrate pi day  is of course with pie! people enjoy small pies and large ones apple  pies and pizza pies pies backed into  numbers or the  shape of Greek litter pi. sometimes  people  from human pi like the student in this picture. March 14, pi day is also physicist Albert Einstein 's birthday . princeton  University  where  Einstein  taught for many year hosts an annual birthday  party, with puzzle contests a parade and plenty of pizza pi for more about pi  day. visit piday. org.