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Equations of Circles and Tangents

Equations of Circles and Tangents

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Practice Questions and Resources

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Solutions

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Key Points 

  • Circle equation:(x−a)²+(y−b)²=r²

  • Centre = (a,b)

  • Radius = √r²

  • Radius is perpendicular to the tangent.

  • Use gradients to find tangent equations.


Keywords: equations of circles, tangents to circles, GCSE circle equations.

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