Given point $(p,q,r)$ and 3 points which make up a triangle, find the closest point in the triangle to the point in space. From the triangle, we can find the equation of the plane $Ax+By+Cz+d=0.$
EDIT: I am trying to ask a similar form of my other question, but in a more general form. I need to program a solution to this problem for any scenario. See comment below