Question: A quadrilateral element has in the local coordinate system (r,s) the following vertex coordinates: A (1,1) ; B (1,1) ; C (1,1) ; D (1,1)

A quadrilateral element has in the local coordinate system (r,s) the following vertex coordinates: A (1,1) ; B (1,1) ; C (1,1) ; D (1,1) . The same element is mapped on the global coordinate system (x,y) via the following transformation: x=7r y=9s Calculate the value of the Jacobian

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