Five marks exercise problems IX — task. Mathematics State Board, Class 9.

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Find the area of a quadrilateral

$ABCD$ whose sides are

$AB = 13 \ cm$ ,

$BC = 12 \ cm$ ,

$CD = 9 \ cm$ ,

$AD = 14 \ cm$ and diagonal

$BD = 15 \ cm$ .

Area of

$ABCD$

$=$

$cm^2$

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