Rectangular cake divided in to two equal parts in one attempt.(microsoft 2012 riddle)

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Puzzle: Given a rectangular (cuboidal for the puritans) cake with a rectangular piece removed (any size or orientation), how would you cut the remainder of the cake into two equal halves with one straight cut of a knife? Solution: Join the centers of the original and the removed rectangle. It works for cuboids too! BTW, I have been getting many questions asking why a horizontal slice across the middle will not do. Please note the "any size or orientation" in the question! Don't get boxed in by the way you cut your birthday cake Think out of the box. POST YOUR OPINION IF YOU HAVE BETTER SOLUTION

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Puzzle:
Given a rectangular (cuboidal for the puritans) cake with a rectangular piece removed (any size or orientation), how would you cut the remainder of the cake into two equal halves with one straight cut of a knife?

Solution:
Join the centers of the original and the removed rectangle.
It works for cuboids too! BTW, I have been getting many questions asking why a horizontal slice across the middle will not do. Please note the "any size or orientation" in the question! Don't get boxed in by the way you cut your birthday cake Think out of the box.

POST YOUR OPINION IF YOU HAVE BETTER SOLUTION