Rhonda

You will need to trim the FGs on each side of the triangle so you have a 1/4" seam allowance on each side.

In the first picture you can see the FG section as I have it trimmed.
Then add both FG sections to the center section.

Now on to the last section the Triangles Corners

Sew a light and dark together and using the corner of your ruler cut a square as if you were cutting a Half Square Triangle block but you only need two sides cut.