Diagram NOT accurately drawn $$\(A, C\)$$ and $$\(D\)$$ are points on a circle, centre $$\(O\)$$. $$\(A B\)$$ and $$\(C B\)$$ are tangents to the circle. Angle $$\(A B C=74^{\circ}\)$$ Work out the size of angle $$\(A D C\)$$. Show your working clearly.

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