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Find the area of the quadrilateral whose vertices are at
 
(i) \((-9,-2)\), \((-8,-4)\), \((2,2)\) and \((1,-3)\) \(=\)  \(sq. \ units\).
 
(ii) \((-9,0)\), \((-8,6)\), \((-1,-2)\) and \((-6,-3)\) \(=\)  \(sq. \ units\).