Question 21
$ABCD$ and $DEFG$ are squares, $AB=15$ cm, $DE=11$ cm, and $\angle CDG=90^\circ$. Find the area in $\text{cm}^2$ of the shaded quadrilateral.
Answer format: enter one whole number without units. The printed paper uses four answer-sheet digits with leading zeros when needed; ordinary numeric entry is used here.
Answer format: enter one whole number without units. The printed paper uses four answer-sheet digits with leading zeros when needed; ordinary numeric entry is used here.