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A park, in the shape of a quadrilateral ABCD, has ∠C = 900, AB = 9 m, BC = 12 m, CD = 5 m and AD = 8 m How much area does it occupy?

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Given sides of a quadrilaterals are AB = 9, BC = 12, CD = 05, DA = 08 

Let us joint BD 

In ∆BCD applying Pythagoras theorem

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