Circumference = (pi) x (diameter)
Diameter = (circumference)/(pi) = 72/pi feet, exactly.
That's the only way to write the exact diameter.
It can't be done with numerical digits.
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Circumference of a circle = (pi) x (diameter) = 42 pi = 131.947 feet (rounded)
If the circumference of a circle is 20 feet the diameter is: 6.366 feet (circumference divided by pi = diameter).
The circumference of a circle with a diameter of 50 feet is about 157.1 feet. (diameter x Pi = circumference).
A circle with a diameter of 9 feet has a circumference of about: 28.27 feet (diameter x Pi = circumference).
Assuming the pool is circular with diameter 38 feet, then the circumference equals (pi) x diam/4 = 3.14 x 38/4 feet = 29.83 feet.