Question 390220
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Hi,        
Area of a square = side*side
Question states***
Area(w/o walkway) = 50ft*50ft = 2500ft^2
Area( with walkway) = 58ft*58ft =  3364ft^2
Area (walkway) = 3364ft^2 - 2500ft^2  = 864ft^2
volume(walkway 6" thick) = 1/2 ft * 864f^2 = 432ft^3
432ft^3 is the cubic feet of concrete needed for the walkway