When I started sewing triangles years ago, I used this particular technique to make 2 half square triangles at once. It's simple and quite accurate. Full video: - https://youtu.be/c-eHTFXnnpM Blog post: https://mypatchwork.wordpress.com/2018/03/22/video-tutorial-half-square-triangle-quilt-block-quilting-for-beginners-series | TeresaDownUnder

This is an experiment using striped fabric and half square triangles (HST). See the full video tutorial https://youtu.be/MKBezBLoj7Y and my blog post http://mypatchwork.wordpress.com/2016/06/02/video-tutorial-exploring-striped-fabric-and-half-square-triangles-hsts for more details | TeresaDownUnder