[tex]V = \frac{ {a}^{2} \times H}{3} | \times 3 \\ 3V = {a}^{2} \times H | \div {a}^{2} \\ H = \frac{3V}{ {a}^{2} } [/tex]
[tex] \huge{ \boxed{ \boxed{ \bold{Odp.A}}}}[/tex]
