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Decompose this shape into a rectangle and 2 identical triangles
so
Area of triangle = 1/2(12)(3) = 18
but there are 2 identical triangles, so 18 x 2 = 36
Area of rectangle = 12*11 = 132

so area of the parallelogram = 36 + 132 = 168 

answer
168 ft^2

The answer is the third choice