Next up in the rulers demo was Lynne Edwards' square in a square ruler for creative grids. Unless you are prepared to do tricky calculations based on Pythagoras' theorem this is not a easy shape especially in inches and adding seam allowances. Normally I would draft the shape then measure the side of the square. Originally I thought this ruler was a bit of a waste of space but as this is such a common shape and the ruler is simple to use I've changed my mind a bit. There are lines to cut the strips for squares inside a measured square and then to subcut the inner squares from this strip. Now I've added a picture of my sample block.
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