### Area of quadrilateral

The perimeter of a building is 74'by 59'by 103'by 121'. How can the square footage of the building be calculated?

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The perimeter of a building is 74'by 59'by 103'by 121'. How can the square footage of the building be calculated?

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I would like assistance in setting up the attached problem in order to solve it. A=2.875. X is the value that needs to be solved. In the book they give the value of X as 2.1091

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