1. Is the ratio of the length of the circumference and diameter of the corresponding circle.
2. It is the sixteenth letter of the Greek alphabet .
3. Is an irrational number transcendent.
4. The fractional number closest to it is 3 1 / 7.
5. Also called ludolfino number in honor of Ludolf Van Ceulaer (1540-1610), who could determine its value up to 35 decimal places.
6. According to Archimedes its value should be between: 3 1 / 7 and 3 10/71. (3 1 / 7 = 3.14084, 3 10/71 = 3.14285).
7. William Shanks , investing more 20, calculated the 707 decimal places, but later research found that the amount allowed had error 528.
8. In the binary numbering system = 11.001001000011111101101010.
9.
= 3.14159265358979323846264338327950288 ... 10. In 1949 the ENIAC computer were estimated at just over 70 hours of their first 2000 decimal places.
11. In 1954, numbers reached 3093 in 13 minutes.
12. In 1959 figures were calculated 10000 1 hour and 40 minutes decimal.
13. And the July 29, 1961 IBM reached a decimal expansion to the figure of 100,265.
14. Finally it is said that there was a chick so smart that instead ple say 3.14159
said. 
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