[tex]1)l = 4 \: cm[/tex]
[tex]d = l \sqrt{3} = 4 \sqrt{3} \: cm[/tex]
[tex]2)V = L \times l \times h = 4 \times 3 \times 5 = 60 \: {cm}^{3} [/tex]
[tex]3)Al = Pb \times h = 3l \times h = 3 \times 4 \times 10 = 120 \: {dm}^{2} [/tex]
[tex]4)Al = 4 {l}^{2} = 4 \times {5}^{2} = 4 \times 25 = 100 \: {m}^{2} [/tex]