$$2\times\frac{22}{7}\times13$$
$\frac{572}{7}\approx 81.714285714$
$$\frac{2\times 22}{7}\times 13$$
$$\frac{44}{7}\times 13$$
$$\frac{44\times 13}{7}$$
$$\frac{572}{7}$$
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$\frac{2 ^ {2} \cdot 11 \cdot 13}{7} = 81\frac{5}{7} = 81.71428571428571$
