Looks like all squares except the setting triangles....( those around the edges). The 4 corners are HST ( half square triangles) ...this are created by cutting a square once on the diagonal, thus creating 2 triangles...the only bias there is is the cut from corner to corner, and that will be locked in as you create your rows. The rest of the setting triangles are quarter square triangles...that is a large square cut diagonally twice, thus getting 4 triangles with 2 bias sidesaddle one straight base...those bias sides are again locked into the body of the quilt as you create the rows and that straight edge is the straight edge of your quilt. There should be no reason to use any fusibles.....the dimensions of your pieces should be in your pattern... Just read it a few times and you will be ok.....