In Block 1, all the triangles were right triangles with a 90 degree corner and 2 equal sides, which made using strips for piecing very simple.
Block 2 is a little different. When there are triangles with one corner greater than 90 degrees (obtuse triangles), I have found that cutting a fabric rectangle is the most efficient.
So, for the colored fabrics, we will cut 3" x 7" rectangles.
The above photo shows the last colored section but they would all be sewn the same way.
The background triangles still have a 90 degree corner but the sides are different ...