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By outside distance, do you mean the circumference? The circle has a diameter of 16ft, its circumference is 3.14*16=50.24ft
Circumference of the circular pool: 20*pi feet
Diameter = Circumference/pi
Circumference is pi times diameter. Diameter is circumference divided by pi. Diameter is twice the radius. Radius is half the diameter.
Since the circumference is Pi times the diameter then divide the circumference by Pi (3.14159) to get the diameter