The pattern is made up of squares and equilateral triangles. You will
need a protractor or a compass to draw the 90° and 60° angles in the
pattern.
Make two copies of the pattern. In each copy, cut along the two line
segments joining the triangles marked O. Crease all other line
segments.
Overlap triangles with the same letter in each pattern (triangles
O and D) and glue down. Tape may be used instead of
glue.
Glue triangles A, B, and C of each pattern to triangles D, E, and
F of the other pattern.