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Find the area of a quadrilateral ABCD in which AB = 42 cm, BC = 21 cm, CD = 29 cm, DA =34 cm and diagonal BD =20 cm. 

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Given that Sides of a quadrilateral are AB = 42 cm, BC = 21 cm, CD = 29 cm DA = 34 cm and diagonal BD = 20 cm 

Area of quadrilateral = area of ∆ADB + area of ∆BCD. 

Now, area of ∆ABD 

Perimeter of ∆ABD 

We know that


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