It is 3.1416
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3.1416 if rounded but it's actually 3.1415(9)
Circumference = pi * diameter = 3.14159 * 11.6 = 36.44 Rounded to the nearest ten, that is 40 units.
The square root of pi is 1.77245385091 Not sure about the nearest ten?
3.14159265
pi rounded to the nearest hundredth is 3.142