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side AB= AE + EB= 18cm
side AD= AF+ FD= 10cm
side BC=AD &
side AB=DC
we know that if a rectangle and a triangle have same base and height, then the area of triangle is equal to half the area of rectangle.
Area of Rectangle= base × height
= AD × DC
= 10×18
= 180 cm^2
Therefore area of triangle = 1/2 × 180
= 90cm^2
Therefore the area of the shaded portion is 90cm^2.
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