If A ( - 5 , 7) , B( - 4 , - 5) , C( - 1...

If A ( - 5 , 7) , B( - 4 , - 5) , C( - 1 , - 6) and D ( 4 , 5) are the vertices of a quadrilat-eral, then find the area of a quadri-lateral ABCD .

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