1. Put the metal point of the compass on a corner of the square at point A.

2. The pencil point goes out to the opposite corner of the square--B.

3. Arc the compass down to C.

4. Draw a line extending the side of your square out and finish making a rectangle. 

 You now have 2 sizes to work with inside the whole piece.  Instructions for finding additional dimensions to use within your orthogon are found at the Design Application link.

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