find the area of the quadrilateral of ABCD
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Area of quadrilateral ABCD=21d(h1+h2)
Sum of the length of perpendicular from the remaining two vertices on the diagonal AC=(h1+h2)
h1+h2=12cm.
∴ Area of quadrilateral =21d(h1+h2)=21×12×11=6×11=66 cm2.
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