The three points $$\(A, B\)$$ and $$\(C\)$$ are marked on a centimetre grid. (a) Write down the coordinates of $$\(A\)$$ (1) (b) Find the coordinates of the midpoint of $$\(B C\)$$ (2) (c) Work out the area of triangle $$\(A B C\)$$ $$\(\mathrm{cm}^{2}\)$$ (2) $$\(D\)$$ is the point on the grid so that $$\(A B C D\)$$ is a rectangle. (d) On the grid, mark with a cross $$\((X)\)$$ the point $$\(D\)$$ Label this point $$\(D\)$$ (1)

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