A simple foundation pieced block.
Print or trace the block diagram onto foundation paper, number and cut apart as below.
Foundation piece all the sections. I use freezer paper for my foundation and apply this even to the sections that won't be pieced.
Trim all seam allowances to ¼".
Piece the center section first, being careful to line up the seams.
Attach the two side triangle sections.
Attach the border strips.