Now stack your
Color 1 and Color 2 4-1/4" x 12-3/4" strips, with edges aligned and right sides
the squares at the 4-1/4" points. Mark the diagonals from the top left to the bottom right, as shown left.
Next, sew, 1/4" above and below the marked
diagonal using a scant 1/4"seam, in the direction shown, pivoting
at the square lines. Cut
apart at the 4-1/4" points and ON the marked diagonals. Then use a ruler
to cut each of these once more, making your quarter triangles!
(That was how you Speed Piece Quarter Triangles !)