SOLUTION: concrete can be purchased by the cubic yard. how much will it cost to pour a circular slab 18 ft in diameter by 3 in. for a patio if the concrete costs $40.00 per cubic yard?

Question 197328: concrete can be purchased by the cubic yard. how much will it cost to pour a circular slab 18 ft in diameter by 3 in. for a patio if the concrete costs $40.00 per cubic yard?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
concrete can be purchased by the cubic yard. how much will it cost to pour
a circular slab 18 ft in diameter by 3 in. for a patio if the concrete
costs $40.00 per cubic yard?
:
A circular concrete slab is a cylinder. Vol =
in this cylinder:
r = = 9 ft
h = = .25 ft
:
Find the volume in cu/ft:
V =
V = 63.61725 cu/ft
:
Change to cubic yds; (1 cu/yd = 27 cu/ft) and multiply by $40:
Cost = * 40
Cost = $94.25
:
In practical terms, they may require you to buy 3 cu/yds, which is $120

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