A rectangular field is to be fenced on three sides leaving a side of 20 feet uncovered . If the area of he field is 680 sq. feet of fencing will be required ?
We have : l = 20 ft. and lb = 680 fit.sq., b = 34 ft
`:.` Length of fencing = (l + 2b) = (20 + 68) ft. = 88 ft.
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