The diagram shows a quadrilateral $$\(A B C D\)$$ Diagram NOT accurately drawn In the diagram, $$\(A B C\)$$ and $$\(D A C\)$$ are right-angled triangles. The area of quadrilateral $$\(A B C D\)$$ is $$\(31.5 \mathrm{~cm}^{2}\)$$ Work out the length of $$\(A D\)$$ $$\(\mathrm{cm}\)$$

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