geometria piana
trasformazioni geometriche
https://picasaweb.google.com/marinofurlan2/Area_simmetria?authuser=0&feat=directlink
simmetria centrale
qcentrale2a.gif
centrale
https://picasaweb.google.com/lh/photo/wZawSvhFmmDaP4h0z_spUdMTjNZETYmyPJy0liipFm0?feat=directlink