in filling a swim pool 18 ft rnd x 54 inches deep how many gallons is that?

Answer 1

Vol = pi r^2 h
r=9
h=54/12=4.5
volume = 1145.6 cu ft
1145.6 x 7.481= 8570 gallons
(1 cubic foot = 7.481 gallons)

Answer 2

Assume a circular pool of diameter 18 ft
V = π x 9² x 4.5 ft ³
V = 1145 ft ³
But 1 ft³ = 7.5 gallons
V = 1145 x 7.5 gallons
V = 8588 gallons

Answer 3

If you have a graphing calculator, you can do all similar conversion problems faster.
You go: APPS->SciTools->Enter->Unit Conversion->Volume
volume
= pi (9^2)(54/12) ft^3
= pi (9^2)(54/12) ft^3 (1 gal /0.133681 ft^3)
= 8566.0 gal
---------
Don't do round off until the last step.

Answer 4

I believe your question states 18ft rnd (Circumference) ?
Diameter = Circumference ÷ Pi
= 18 ÷ 3.14 = 5.73ft
Radius = 5.73 ÷ 2 = 2.87 ft.
Depth = 54" = 4.5'
Volume = π x r x r x h (depth) = 3.14 x 2.87 x 2.87 x 4.5
= 116 ft³.
1 ft³ = 7.5 US gallons...116 x 7.5 = 872 US gallons.

Answer 5

That's what I'm wondering, just done it and dreading the water bill! I just checked mine on intexcorp.com. It holds 5894 gallons!