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O piramida triunghiulara regulata are volumul egal cu 3[tex]\sqrt{3}[/tex] cm cubi si inaltimea de 1 cm. Aflati latura bazei.



Răspuns :

[tex]V=\dfrac {A_b\cdot h}{3}\Rightarrow3\sqrt3=\dfrac{A_b}{3}\Rightarrow A_b=9\sqrt3\ cm.[/tex]

Baza find triunghi echilateral, avem
[tex]A_b=\dfrac{l^2\sqrt3}{4}\Rightarrow 9\sqrt3=\dfrac{l^2\sqrt3}{4}\Rightarrow l^2=36\Rightarrow l=6\ cm.[/tex]