$$4 \frac{ 1 }{ 3 } \times 4 \frac{ 1 }{ 3 }$$
$\frac{169}{9}\approx 18.777777778$
$$\left(\frac{4\times 3+1}{3}\right)^{2}$$
$$\left(\frac{12+1}{3}\right)^{2}$$
$$\left(\frac{13}{3}\right)^{2}$$
$$\frac{169}{9}$$
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$\frac{13 ^ {2}}{3 ^ {2}} = 18\frac{7}{9} = 18.77777777777778$
