Question 9Square $ABCD$ has side $12$ cm. Points $E,F$ are the midpoints of $CD,DA$, respectively, and $G=BD\cap EF$. Find the area of quadrilateral $BCEG$. $36\text{ cm}^2$$54\text{ cm}^2$$63\text{ cm}^2$$72\text{ cm}^2$$108\text{ cm}^2$