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If A(-5, 7), B(-4, -5), C(-1, -6) and D(...

If `A(-5, 7), B(-4, -5), C(-1, -6) and D(4, 5)` are the vertices of a quadrilateral, find the area of the quadrilateral ABCD.

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The correct Answer is:
Area of quadrilateral ABCD=Area of `Delta `ABC_Area of `Delta` ADC Ar (ABCD)=72 sq . Units .
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