Mathematics GCSE
equation of a circle
What equation of a circle means in Mathematics GCSE, as defined for Pearson Edexcel.
Definition of equation of a circle
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Reference: Pearson Edexcel
A circle of radius r drawn about the origin has equation x² + y² = r², which is Pythagoras' theorem applied to the right-angled triangle under any point on the circle.
Topics that use equation of a circle
- Algebra - Graphs (Pearson Edexcel GCSE)
Related terms
- area under a graph
- Asymptote
- Asymptotes
- axis of symmetry
- completing the square
- coordinate plane
- Discriminant
- Displacement
Using equation of a circle in the exam
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