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The area of a circle is determined by multiplying the square of its radius by the constant pi. The radius is defined as one half the diameter. The value of pi is 3.14. So, 3.14 * 62 = 113.1 square feet. Since a bag of topsoil covers three square feet, you will need 38 bags, because 113.1 square feet divided by three square feet per bag yields 37.7 bags.
1 acre = 43,560 square feetYou need (43,560 / 5,000) = 8.712 bags.Buy nine.
Well, darling, if you want a concrete slab that's 5 inches thick, you'll need about 0.012 cubic meters of cement and 0.06 cubic meters of sand per square meter. Just make sure you mix it well and pour it like a boss. Good luck with your project, sugar!
You need to buy 14 bags.area = pi * (13/2)^2 = 132.73... ft2
12 in = 1 ft Volume = 311 sq ft × 2 in = 311 sq ft × (2 ÷ 12) ft = 51 5/6 cu ft (≈ 51.8 cu ft) = 51 5/6 ÷ 0.8 cu ft/bag = 64 19/24 bags ≈ 64.8 bags → you need to buy 65 bags.