Use this method to make two quarter square triangles with the 90 degree angle on the right.
Turn your template over so the 90 degree angle is on the left. This is technically B reversed.
Rotate your Half square triangle from the first cutting step so that it makes perpendicular lines on your fabric.
Place the B (Reversed) template against it and cut in the same manner. You will need two quarter square triangles with the 90 degree angle on the left.