The circle C C\,C has the equation x2+y2−10x−6y+21=0x^2 + y^2 - 10x - 6y + 21 = 0x2+y2−10x−6y+21=0
Find (i) the coordinates of the centre of C C\,C and (ii) the exact radius of CCC.
292 exam-style questions on Edexcel A Level Maths Circles, covering 6.1 Midpoints and Perpendicular Bisectors, 6.2 Equation of a Circle, 6.3 Intersections of Straight Lines and Circles, 6.4 Use Tangent and Chord Properties, and 6.5 Circles and Triangles. Each one has a worked solution and a mark scheme showing where the marks go.