geometry - Given a light source and a triangle in space, find area of the triangle's projection onto a plane - Mathematics Stack Exchange

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Problem We have a light source in $L = (0, -2, 5)$, and we have a triangle $ABC$, given by the points $(0, 0, 2), \ (3, 0, 2), \ (0, 0, 3)$. We are also given that the point $C$ projects to $C' =

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