A security fence encloses a rectangular area on one side

A security fence encloses a rectangular area on one side of a park
in a city. Three sides of fencing are​ used, since the fourth side of the area is formed by a building. The enclosed area measures 392 square feet. Exactly 56 feet of fencing is used to fence in three sides of this rectangle. What are the possible dimensions that could have been used to construct this​ area? The shorter dimension of the fenced area is ___ feet?
feet.
 
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