GCSE Maths (Edexcel)

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Equation of a Circle

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Algebra Graphs

Equation of a Circle

4:23 Graphs of Circles
Spec A16
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  • A circle with its center at the origin can be described by an algebraic expression
  • The equation of a circle centered on the origin is x^2 + y^2 = r^2, where r represents the distance from the center to any point on the circle
  • Each point on the circle is the same distance r from the origin
  • The equation of a circle centered on the origin is derived from Pythagoras theorem
  • To draw a circle, determine the radius and mark the points where the circle will cross each axis
  • Draw a circle passing through these points

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