Question 25
In the figure, the area of square $WXYZ$ is $25 \text{ cm}^2.$ The four smaller squares have sides $1$ cm long, either parallel to or coinciding with the sides of the large square. In $\triangle ABC,$ $AB = AC,$ and when $\triangle ABC$ is folded over side $\overline{BC},$ point $A$ coincides with $O,$ the center of square $WXYZ.$ What is the area of $\triangle ABC,$ in square centimeters?
