Circumference of the pool = 2*pi*72 = 452.369 feet to 3 dp
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452.38 feet = circumference1.) Formula for circumference (perimeter) of a circle = 2 x pi x radius OR pi x diameter(because 2 x radius = diameter)2.) Pi = 3.14153.) 2 x 3.1415 x 72 feet = 452.38 feet
2*72 feet * 3.141592=452.4 feet
A 20 foot round pool has a radius of 3.2 feet. So the pool has a volume of pi*r2*h = 101.86 cubic ft approx.