Paper 2 rarely gives you a plain circle. It gives you a shape built from a rectangle and a semicircle, or a circle cut out of a square, or a path running round a pond. The method never changes: break the figure into pieces you already know, work out each piece, then add or subtract. Two traps recur. For area, decide whether the pieces are being joined (add) or one is being removed from the other (subtract). For perimeter, only walk round the OUTSIDE — any edge where two pieces meet is inside the shape and does not count.
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