AJUTOOOOR !!!!! VA ROOOOOG !!!!!! DAU COROANA !!!!!! <3

Consideram cubul ABCDA'B'C'D' .

Demonstrati ca :

a). B'C ⊥ BC' ;
b) . B'C ⊥ (ABC') ;
c) . (A'B'C) ⊥ (ABC') .


Răspuns :

a) BC' si B'C, diagonale de patrat deci perpendiculare
as simple as that!!!
Vezi imaginea ALBATRAN
Vezi imaginea ALBATRAN