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Question: can someone help explain this for me thanks i only...

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Exercise. Let (0,0,0), (2, 1,1), (-1,2, -8) and (1,-1,5) be the vertices of a polygon. What is the area A of this polygon? As a gesture of friendship, check out this polygon in 3D-space 10 2 10 8 6 4 14

Can someone help explain this for me. Thanks. I only know how to do 2D Polygon.

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