The diagram shows a quadrilateral $$\(A B C D\)$$ on a centimetre grid. (a) Work out the area of triangle $$\(A B C\)$$. You must include the units with your answer. (3) (b) Give a reason why angle $$\(A C D\)$$ is equal to angle $$\(C A B\)$$. (1) (c) Write down an equation for the straight line that passes through $$\(D\)$$ and $$\(C\)$$. (1)

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