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Question 131

The circle C C\,C has centre (3,−4)(3, -4)(3,−4) and exact radius 21\sqrt{21}21​

a.

Find the equation of C C\,C in the form x2+y2+ax+by+c=0x^2 + y^2 + ax + by + c = 0x2+y2+ax+by+c=0.

[3]
b.

The line with equation y=ky = ky=k where k k\,k is a constant, is a tangent to CCC. Find the possible values of kkk.

[2]
Markscheme

Circles Questions

  1. A Level
  2. /Maths
  3. /Circles

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.

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