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a)cate varfuri,cate muchii si cate fete are un tetraedru?
b)cate varfuri,cate muchii si cate fete are opiramida patrulatera?


Răspuns :

   
[tex]a)~~\bold{Tetraedrul:} \\ ~~~~~~~~~v = 1 + 3 = 4~varfuri \\ ~~~~~~~~~m = 3 + 3 = 6~muchii \\ ~~~~~~~~~f = 3 + 1 = 4~fete \\ \\ \\ b)~~\bold{Piramida~patrulatera} \\ ~~~~~~~~~v = 1 + 4 = 5~varfuri \\ ~~~~~~~~~m = 4 + 4 = 8~muchii \\ ~~~~~~~~~f = 4 + 1 = 5~fete [/tex]