Area of rectangle having vertices a, b, c and d with position vectors minus I vector + 1 by 2 J vector + 4 k vector, I vector + 1 by 2 J vector + 4 k vector, I vector minus 1 by 2 J vector + 4 k vector and minus I vector minus 1 by 2 J vector + 4 k vector respectively is
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area of rectangle =|AB ×BC|
so using the position vectors find AB and BC
cross multiply them and take their magnitude
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