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Downsize 2x2 (solution)  

Puzzle 1. The solution is shown in the left diagram. The approach can be described as "folding" of the frame. Folding three matchsticks (shown as black) inside the square reduces its area by two square units - the shaded right triangle equals the area of one square unit.

Puzzle 2. The solution starts the same is in Puzzle 1 but then two matchsticks are "unfolded" back in order to add one square unit back to the shape - see the right diagram.
 
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    Last Updated:
December 12, 2007
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