Interestingly, in my city the manhole covers are equilateral triangles (Nashua, New Hampshire). http://farm3.static.flickr.com/2164/2377255702_fec42f19b2.jpg h

Interestingly, in my city the manhole covers are equilateral triangles (Nashua, New Hampshire). http://farm3.static.flickr.com/2164/2377255702_fec42f19b2.jpg http://farm3.static.flickr.com/2164/2377255702_fec42f19b2.jp... If ever asked I would try to convince them of the triangular merits.