# Chapter 8 - Geometry - 8.4 Parallelograms and Trapezoids - 8.4 Exercises: 20

Cost per square foot = \$1.60 #### Work Step by Step We must first determine the area of the office space. Area of a Trapezoid =$A$=$\frac{1}{2}h$($b$+$B$) Therefore:$A$=$\frac{1}{2}$(20 ft)(20 ft + 32 ft)$A$=$\frac{1}{2}$(20 ft)(52 ft)$A$= (10 ft)(52 ft)$A$= 520 ft$^{2}$Next, to get the cost per square foot we simply divide the total cost by the number of square feet. Therefore: Cost = \$832 / 520 Cost = \\$1.60

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