Approximating a square

Materials:

• a rectangular piece of paper
• a hard working surface (eg. table top)
  

Instructions:

1. Take a rectangular piece of paper.
   
   
   
2. Fold the paper at right angles. In the example below, the left edge of the page aligns perfectly with the top edge of the page.
   
   
   
   
3. Lay the folded paper to look like the photo below.
   
   
   
   
4. Fold the left edge over, using the vertical edge of the folded triangle as a guide.
   
   
   
   
5. Align the bottom edge of the left flap with the bottom edge of the folded triangle.
   
   
   
   
6. To look like this:
   
   
   
   
7. Undo the folded left flap. Your sheet should look like this.
   
   
   
   
8. Cutting along the folded vertical edge will give you a good approximation of a square!