Method #1



Fold the corner to the opposite side to form a triangle. Cut along the vertical line of the rectangle. The rectangular strip left over can be used for making smaller squares.
 

 

 

Method #2



For a square without a diagonal crease, place two identical sheets of rectangular paper as shown. Cut the bottom sheet along the raw edge of the top sheet. The sheet underneath is now a square. For a second square, turn both layers over and cut the larger sheet using the raw edge of the square as a guide.
 



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