Assuming you have enough concrete to cover 72 ft for a walkway that will surround the pond. The width of the walkway be is 2ft.
Width of the walkway
Area=Length×Width
72=(6+2x) (8+2x)-48
72=48+12x+16x+4x²-48
72=4x²+28x
0=4x²+28x-72
0=x²+7x-18
0=(x+9) (x-2)
x=-9 or 2
x=2ft
Inconclusion assuming you have enough concrete to cover 72 ft for a walkway that will surround the pond. The width of the walkway be is 2ft.
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