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I cut a piece of upholstery fabric about 20" by 28" and sewed a piece of striped cotton on top so I wouldn't need to draw lines. One by one, I folded the squares in half to form a triangle and sewed them on the backing in rows. It took about 50 rows to cover the base with about 80 squares in each row. That's about 4000 squares, approximately ten yards of fabric.
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Hopefully it will wash well and last a long time.
Finally now I can get back to quilting!