Nsogbu nke 47 nke Euclid

Nke a bụ ebe ihe na-enweta ntakịrị geometric, yabụ were anyị. Nsogbu nke 47 nke Euclid - nke a makwaara dị ka theorem Pythagorean - na-egosipụta mkpa ọ dị "square site square." Na omume kwa ụbọchị, nke a pụtara idobe ndụ gị n'usoro, yana n'ịrụ akụrụngwa, nke a bụ usoro Freemason na-agbaso mgbe ịtọ ntọala.