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area of a quadrilateral (2011 HOMC Junior Q11)

Source:

July 18, 2019
geometryarea

Problem Statement

Given a quadrilateral ABCDABCD with AB=BC=3AB = BC =3 cm, CD=4CD = 4 cm, DA=8DA = 8 cm and DAB+ABC=180o\angle DAB + \angle ABC = 180^o. Calculate the area of the quadrilateral.