Find Area of Figure $3 \frac{1}{6} \mathrm{in}$ on a Side $20 \frac{1}{18}$

Multiple Choice

Find area of figure. Round to the nearest hundredth if necessary.
-Find the area of a square measuring $3 \frac{1}{6} \mathrm{in}$ . on a side.

A) $20 \frac{1}{18}$ in. $^{2}$
B) $6 \frac{1}{3} \mathrm{in}.^{2}$
C) $10 \frac{1}{36}$ in. $^{2}$
D) $12 \frac{2}{3}$ in. $^{2}$