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A farm is to be built in the shape of Quadrilateral ABCD, as shown below. All four sides are equal. A rhombus ABCD is shown with diagonal AC equal to 16.8 feet and diagonal BD equal to 11.9 feet What is the area of the farm?
A 57.4 square feet
B 99.96 square feet
C 114.8 square feet
D 133.28 square feet