3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679
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3.141592653589
3.14159 ======
Because - no matter how big a circle is - if you divide the circumference by the diameter - you will ALWAYS get the value of Pi ! As an approximate fraction, the value is 22/7. As a decimal , it's an infinite number.
Pi times pi equals 9.869604401089358 (to 15 decimal places).The square value 9.8696 is commonly used.If you use (pi)2 = 10 in your calculations, your answer is only wrong by about 1.3% .
The 91st decimal is 3.