please gave my answer .
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find the area of three triangles enclosed within the quadrilateral separately. then add up ur answers
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Area of quadrilateral = (½) × diagonal length × sum of the length of the perpendiculars
so,area of quadrilateral =1/2×12×(8+5)
=1/2×12×13
=78cm²
hope it will help you.
please mark it as brainliest.
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