Brownies

Riddle

I made a pan of brownies (rectangular) for my two friends to split. However, I have come back to find that a rectangular shaped piece is missing. Assuming that the piece is in a random location at a random angle, how can I cut the brownies in half so each of my friends will have an equal share? (You get one straight cut and your solution must work for any location of the brownie. You also cannot cut the pan in half horizontally, i.e., if the pan is 2 inches thick, cutting parallel to the top of the brownies at the 1 inch mark. This would be too messy!)

The Answer to the Riddle

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