Posted by Dwight on Friday, October 1, 2010 at 1:09pm.
Calculate vector BA and add it to point C to get point D, similar to sliding the line BA until it fits on C.
Vector BA
= coordinates of A - coordinates of B.
=(1,-2,4) - (3,5,7)
=(-2,-7,-3)
You can take it from here.
Do check your calculations by comparing the mid-points of AC and BD. They should be identical since the diagonals of a parallelogram bisect each other.
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