$$5.7 \times \sqrt{ 3 } /2+5.7 \times 1/2$$
$\frac{57\left(\sqrt{3}+1\right)}{20}\approx 7.786344802$
$$2.85\sqrt{3}+\frac{5.7\times 1}{2}$$
$$2.85\sqrt{3}+\frac{5.7}{2}$$
$$2.85\sqrt{3}+\frac{57}{20}$$
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$\frac{57 {(\sqrt{3} + 1)}}{20} = 7.786344801571301$
