Originally Posted by yngldy

I look at making your pattern a little differently. Your pattern exist of one black triangle; a gray piece consisting of 3 triangles point up, down, up; and yellow of 4 triangles, up, down, up, down. (Look at the gray and divide it into 3 triangles, 1 pointing down, middle up, next one down.) What ever size triangle you want to use will work, and angles will be correct. Just draw around your shapes without seam allowances to make the shapes you need and add 1/4" on edges for seams. If you mark your points for a few times when sewing your seams, you will get the hang of the overlaps at the ends, and the piecing will be easier. Hope I explained this so you can understand.