Question: Let S be a planar region in three-space, and let Sxy, Sxz, and Syz be the projections on the three coordinate planes (Figure 10). Show

Let S be a planar region in three-space, and let Sxy, Sxz, and Syz be the projections on the three coordinate planes (Figure 10). Show that
[A(S)]2 = [A(Sxy)]2 + [A(Sxz)]2 + [A(Syz)]2

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