Paper 2 · Co-ordinate Geometry of the Circle
⏱ Tested in 1 exam question since 2023
Lesson 9 of 9
The Circle 9 – Simultaneous Equations
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- Find the circle through three points by subbing each into x²+y²+2gx+2fy+c = 0
- Solve the resulting 3×3 linear system in g, f and c by elimination
- Pick pivot equations from points with a zero coordinate to cut the algebra
Most recent exam questions
- 2023 Paper 2 Q4(b) — find the equation of a circle given three points on it — exploit the geometric observati…
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