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June 2011 p11 q3
1350
(i) Sketch the curve \(y = (x - 2)^2\).
(ii) The region enclosed by the curve, the \(x\)-axis and the \(y\)-axis is rotated through \(360^\circ\) about the \(x\)-axis. Find the volume obtained, giving your answer in terms of \(\pi\).
Solution
(i) The curve \(y = (x - 2)^2\) is a parabola opening upwards with vertex at \((2, 0)\). It touches the positive \(x\)-axis at \(x = 2\).
(ii) To find the volume of the solid of revolution, use the formula for the volume of a solid of revolution about the \(x\)-axis: \(V = \pi \int (y)^2 \, dx\).