it is a basic 4 patch pattern.
Draw a 10 square on 4x4 graft paper.
Divide into 1/4th.
Then Divide each square long ways into half. You should have rectagles of 2/5" x5" Cut out two.
On one, Dived in half and draw your triangle.
This will give you the finished size of each Piece.
Then redraw each cut piece on graft paper and add the 1/4" seam all around each piece.
You will then have templates for each piece to produce a 10" finished block.
You can either use the pieces to mark and cut or measure and rotary cut.