Mr.Jack have $128.The man give $22 back. Mr. Jack now have $106.How many the man have now?
1 answer:
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you need 628 square feet of sand.
<h3>How many cubic feets of sand are needed?</h3>
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:
Where pi = 3.14
Then we have:
To get that in feets, we need to divide by 12 squared, then:
So you need 628 square feet of sand.
If you want to learn more about volumes:
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