16 designs by sef
All designs by SEF
Specialist in maths, science, computing, music, dance etc. Click through to
Special cases of rectangles, where the root of the ratio of sides is a rational number, so that there are rotational angles where the vertices line up along the axes again. This includes squares, A#-papers (ie root 2), hexagons (ie root 3 based) and root 5 combinations etc.