I'm in desperate need of some newbie help!

Think the earth.  I've got two points on the Earth, the upper left and lower
right of a rectangle (think square, not box).  Now those two points lie on a
plane.  I know which plane because a vector from the center of the earth
(0,0,0) to the center of the square is perpendicular to this plane.  Now,
all I want to do is translate and rotate the square to the origin so I can
work on it as if its center was at 0,0,0.  Then, I want to translate and
rotate it back to the original position.

How do I do that using matrices....

Thanks,
Michael

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