Happy Pi Day

Some Pi Facts

• In the Greek alphabet, p is the 16th letter (and 16 is the square of 4). In the English alphabet, p is also the 16th letter, and i is the 9th letter (the square of 3). Add them up (16 +9), and you get 25 (the square of 5). Multiply them (16 x 9), and you get 144 (the square of 12), divide 9/16, and you get 0.5625 (the square of 0.75). It’s no wonder that they say, “ Pi are squared.

•  Pi is the number of times a circle's diameter will fit around its circumference.

•  Here are the first 100 decimal places of PI

              3.1415926535897932384626433832795028841971693993751058209

                 749445923078164062862089986 280348253421170679 

•  The fraction (22 / 7) is a well-used number for Pi. It is accurate to 0.04025%.

• Another fraction used as an approximation to Pi is (355 / 113) which is accurate to 0.00000849%.

• A more accurate fraction of Pi is (104348 / 33215). This is accurate to 0.00000001056%.

• There is no zero in the first 31 digits of Pi.

• Pi is irrational. An irrational number is a number that cannot be expressed as a ratio of integers.

• Half the circumference of a circle with radius 1 is exactly Pi. The area inside that circle is also exactly Pi!

• At position 763 there are six nines in a row. This is known as the Feynman Point.

• Write the letters of the English alphabet, in capitals, clockwise around a circle,  and cross out the letters that have right-left symmetry,A,H,I,M, etc.The letters that remain group themselves in sets of 3,1,4,1, 6".

• Pi is also referred to as the “circular constant,” “Archimedes’ constant,” or “ Ludolph’s number".

• ”Pi Day” is celebrated on March 14 (which was chosen because it resembles 3.14).The official celebration begins at 1:59 p.m., to make an appropriate 3.14159 when combined with the date.