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The area of any quadrilateral equals \frac{1}{2}\times one diagonal \times (sum of the perpendiculars drawn to it from the other two vertices).
In the quadrilateral ABCD shown, diagonal AC = 18 cm, BE ⊥ AC with BE = 6 cm, and DF ⊥ AC with DF = 8 cm. Find the area of ABCD in cm².
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