Eleanor Burns --- has a section in one of her books where you cut 12x18 inch piece of fabric of dark and light and you draw squares and then diagial lines and you sew 1/4 inch from the line and you come out with alot of 1/2 squared triangles.... I do not remember which one of her books this is in.. and I have seen other do it marsha mclusky uses a different technique but she does alot of 1/2 trangles - which you might want to try if you are doing alot of 1/2 trangles... (Marsha does alot of feathered star with alot of 1/2 trangles) ---- 1/2 trangles are my nemis...but I have found these techiques help if you are doing alot of 1/2 trangles....