Mathematics A-Level
Centre-radius form
What Centre-radius form means in Mathematics A-Level, as defined for Pearson Edexcel.
Definition of Centre-radius form
Check what you remember
Read the wording for your board, then hide it and explain Centre-radius form in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: Pearson Edexcel
The equation of a circle written as (x − a)² + (y − b)² = r², giving centre (a, b) and radius r.
Topics that use Centre-radius form
- Coordinate geometry in the (x, y) plane (Pearson Edexcel A-Level)
Related terms
- angle in a semicircle
- Completing the square
- Eliminating the parameter
- gradient
- linear modelling
- negative reciprocal
- Parallel and perpendicular gradients
- Parameter
Using Centre-radius form in the exam
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