Originally Posted by nan
Are all these triangles double fabric? How do you sew them together, so the seam is on one side? What if the other pieces are not doubled, does that not matter?
Yes, the triangles are double fabric. I began with 9 1/2 inch squares. Lay . two squares,of contrasting fabrics, right sides together and sew around all four sides. Cut on the diagonal from top left to bottom right and from top right to bottom left. Open and press seams to the dark and you now have 4 HST's. If you have a hard time working with bias edges, cut out your squares with point, on your template or ruler, on the straight of grain.
You can cut the squares alone, without the two squares facing if you just want to cut out triangles. In this method you are getting half square triangles and not just triangles.
Hope I have answered your question, if not I will take some more photos doing the process again for you.