3.141592653589
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3.14159 ======
It is: 12/pi = 3.8197 inches rounded to 4 decimal places
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% .
3.14159265358979323846264338327950288419716939937510
3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679