koita an aneferesai se fetes tha exeis 0,1,2,3,4
an anaferesai se tetragwnakia th aexeis 0,2,4,6,8
babaiws yparxei kai h pithanothta h mia feta na nai monokommath xwris na apoteleitai apo dyo tetragwnakia
ps:fetes kai paparies.trapezioi+pplath ftw
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"Physics is like sex. Sure, it may give some practical results, but that's not why we do it." - R. P. Feynman