A fla quadrilateral plate finit element is shown (see Example 2.21 on p. 110 for a description of what a finit element is).
(a) Describe and perform a test, using two cross products that will verify if all four nodes (corners) lie in the same plane.
(b) Determine the unit outward normal direction to the surface (i.e., pointing away from the origin).
(c) Determine the surface area of the element.
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