In quadrilateral

MATHEMATICS · Single correct · GCSE · Mathematics · Geometry and Measures · Geometry and Measures

Problem

In quadrilateral ABCDABCD, the sides are AB=7 cm,  BC=10 cm,  CD=9 cm,  DA=8 cmAB=7\,\text{cm},\;BC=10\,\text{cm},\;CD=9\,\text{cm},\;DA=8\,\text{cm} and the diagonal AC=11 cmAC=11\,\text{cm}. Find the area of ABCDABCD (correct to two decimal places). (a) 71.00 cm271.00\,\text{cm}^2 (b) 72.35 cm272.35\,\text{cm}^2 (c) 69.79 cm269.79\,\text{cm}^2 (d) 65.12 cm265.12\,\text{cm}^2

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