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A rectangular field is to be fenced on three sides leaving a side of $20$ feet uncovered. If the area of the field is $680$ sq feet, how many feet of fencing will be required?

1. $34$
2. $40$
3. $68$
4. $88$

Option D. 88

Area of a Rectangle = l × b [ Given that area = 680 sq feet, one side = 20 feet(say l) ]

b = $\frac{680}{20} = 34$ feet

The perimeter of a Rectangle = 2(l + b)

only three side is needed i.e. 2b + l = 88 feet

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