Cutting a hexagon from a square sheet

There are several ways you can cut a hexagon from a square sheet of paper. The most accurate would be to use a template, but if you have different sizes of paper, you would need many templates. Instead, I like to measure out the edges and cut hexagons individually from sheets. I've tried several methods but my favorite requires a 30º triangle ruler (along with a normal straight edged ruler) to mark the edges. For precision, an Exacto-style knife and ruler on a cutting board, or a paper trimmer with a sliding blade, are the best ways to cut the edges, but scissors also work.