I wanted to make hexagons but didn't want to purchase yet another ruler. I have so many 2.5" strips laying around and wanted to use them in a project. So I decided to test my hexagon theory. With my equilateral triangle ruler I cut a triangle first and then a coordinating hexagon from some extra 2.5" strips that I had.
My ruler has marks in yellow for finished triangles and marks to the side for the width of strip. I have pointed out these marks below. Your ruler should have one of these marks on it.
Since 2.5" strips sewn together equal 4" I put my strip on the 4" finished 4.5" cut line to create coordinating hexagons for my triangles. when sewn together they make the perfect 4.5" unfinished equilateral triangles.
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I'm sure with a little configuring that you could do the same with other strip widths. This ruler goes up to 6" finished triangles so you could probably do 3.5" strip widths to make the maximum size triangle.
Thanks for reading