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Saturday, 15 january 2011

Saving Faces

Proposed by ixirimdiOffline
(16 comments)10.703 times displayed

Imaginati-va ca aveti o piramida cu o baza patrata si partile patru triunghiuri echilaterale. Mai aveti si un tetraedru. Cele patru fete ale sale sunt triunghiuri echilaterale congruente cu partile piramidei. Cu alte cuvinte, toate marginile celor doua corpuri sunt de aceeasi lungime.

 Acum sa presupunem ca lipiti una dintre fetele laterale ale piramidei  de una dintre fetele tetraedrului. Cate fete va avea noul poliedru ?

Erau noua fete in total, nu ? Pentru ca au disparut doua dupa lipire, raspunsul trebuie sa fie 9-2=7. Corect ? GRESIT !

 

Tags: saving, faces
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