Sorry I used these as pictures in a workshop. I ask what they see in the picture , a wrong line would b e for them to find as all quilters can do the diagonal join.
I also try to not say this is the correct and only way
Widths 2" by 6 " for rectangles
The large triangle was a square halved .
I did make al. Pieces much larger for mistakes and to change sizes.
Look at the cutting board and the inch marking lines.
Thank you all for the comments.