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the circumference is 21.98 inches
The circumference is about 43.98 inches. The circumference of a circle is diameter (radius x2) x pi (3.14).
First the closest square is 52=25 so the first digit is 5 Then you write two 0 at the right of 31 -> 3100 and try to find the closest square between 50 and 59 (5 is the first digit found) The closest square to 3100 is 55, 552=3025, 562=3136, so the second digit is 5 and one gets 55 Now with 310000 and a number between 550 and 559, the closest square is 5562=309136, the third digit is 6 and so on.... So sqrt(31)=5.56....
It is 0.3 because the digit after 3 is less than 5