Question 17
In rectangle $ABCD$, $AB=\sqrt3$ cm, $BC=3$ cm. Put a right triangle $DCE$ outside $ABCD$ and along edge $CD$ and $\angle CDE=30^\circ$. Flip along $AC$ such that $B$ lands at $K$. Join $KA$, $KC$, $KE$, $KD$, as in the figure. What is the area of the shaded region, in cm$^2$?
