Răspuns :
[tex]\it \mathcal{V}=\mathcal{A}_b\cdot h=100\sqrt3\cdot 4=400\sqrt3\ cm^3\\ \\ \mathcal{A}_b=\dfrac{\ell^2\sqrt3}{4}=100\sqrt3 \Rightarrow \ \ell^2=100\sqrt3\dfrac{4}{\sqrt3}==400=20^2 \Rightarrow \ell =20\ cm[/tex]
[tex]\it \mathcal{V}=\mathcal{A}_b\cdot h=100\sqrt3\cdot 4=400\sqrt3\ cm^3\\ \\ \mathcal{A}_b=\dfrac{\ell^2\sqrt3}{4}=100\sqrt3 \Rightarrow \ \ell^2=100\sqrt3\dfrac{4}{\sqrt3}==400=20^2 \Rightarrow \ell =20\ cm[/tex]