Question

Sand will be placed under a circular pool with a diameter of 20 feet. The sand depth should be 2 inches. How many cubic feet of sand are needed?

Answer 1

you need 628 square feet of sand.

How many cubic feets of sand are needed?

Here we need to find the volume of the sand needed.

The volume filled with sand will be a cylinder of diameter of 20ft, and a height of 2 inches.

First, the radius is half of the diameter, then:

R = 20ft/2 =10ft

Remember that:

1ft= 12in

Then:

R = 10ft = 10*(12 in) = 120 in

And remember that the volume of a cylinder of radius R and height H is:

$V = pi*R^2*H$

Where pi = 3.14

Then we have:

$V = 3.14*(120 in)^2*2in = 90,432 in^2$

To get that in feets, we need to divide by 12 squared, then:

$90,432 in^2 = 90,432ft^2/(12^2) = 628 ft^2$

So you need 628 square feet of sand.

If you want to learn more about volumes:

brainly.com/question/1972490

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