Question
Two identical triangles, DEC and ABF, overlap each other as shown. Given that DE = AB = 12 m and EC = FB = 11 m, what is the area of the figure that is unshaded?
3 m

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Two identical triangles, DEC and ABF, overlap each other as shown. Given that DE = AB = 12 m and EC = FB = 11 m, what is the area of the figure that is unshaded?