Question

Find the area of quadrilateral ABCD whose sides are 13cm,12cm,9cm,14cm and one of the diagonal is 7.5cm
$\frac{a + b + c}{2 } and \: \sqrt{s(s - a)(s - b)(s - c)}$
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Answer 1

Answer:

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Answer 2

Answer:

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I haven't solved in the book but try to find the answer for u and that answer is in the attachment above↑