The diagram shows trapezium $$\(A B C D\)$$ in which $$\(B C\)$$ and $$\(A D\)$$ are parallel. The trapezium has exactly one line of symmetry. $$\(B C=8.4 \mathrm{~cm}\)$$ $$\(A D=17.6 \mathrm{~cm}\)$$ The trapezium has area $$\(179.4 \mathrm{~cm}^{2}\)$$ Work out the size of angle $$\(A B C\)$$. Give your answer correct to 1 decimal place. $$\(\circ\)$$

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