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The circle C has equation. x2 + y2 + 4x − 2y − 11 = 0. Find (a) the coordinates of the centre of C, (2) (b) the radius of C, (2) (c) the coordinates of the points where C crosses the y-axis, giving your answers as simplified surds. (4) May 2011. 5. The circle C has centre (3, 1) and passes through the point P(8, 3). (a) Find an equation for ... ................
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