Clean O(1) construction of sqrt(11).
Clean sqrt(11) in O(1) (fixed) steps. /2 first to avoid sqrt(2) scaling at end. Use arcs instead of full circles to reduce clutter (un-displayed points are just arc construction points). Use an odd number so that construction is clearly geometric and not using the integer grid. Assume that ray (y,0) -> (y,1) can be constructed as a parallel line, but nothing else. D is constructed this way, but even BG = x/2+1 is constructed by using that unit ray and not by adding vectors.