[tex]1)a = 11 \: cm[/tex]
[tex]A_{t} = 6 {a}^{2} = 6 \times {11}^{2} = 6 \times 121 = 726 \: {cm}^{2} [/tex]
[tex]2)a = 3 \frac{1}{2} = \frac{3 \times 2 + 1}{2} = \frac{6 + 1}{2} = \frac{7}{2} = 3.5 \: cm[/tex]
[tex]A_{t} = 6 {a}^{2} = 6 \times {3.5}^{2} = 6 \times 12.25 = 73.5 \: {cm}^{2} [/tex]
[tex]3)a = 2.25 \: cm[/tex]
[tex]A_{t} = 6 {a}^{2} = 6 \times {2.25}^{2} = 6 \times 5.0625 = 30.375 \: {cm}^{2} [/tex]
