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Circle Theorems
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Spotting the clues

Spotting the clues

Composite figure showing a radius perpendicular to a tangent, a centre angle twice a matching circumference angle, opposite angles in a cyclic quadrilateral summing to 180 degrees, and the alternate segment theorem

Circle theorems help you turn a picture into facts about angles and lengths. Most questions become easier once you label the centre, tangents, chords, and any equal radii.

Circle Theorems Lesson

  1. IGCSE
  2. /Maths
  3. /Circle Theorems

Step-by-step lessons on Edexcel IGCSE Maths Circle Theorems. Each one builds up to exam-style questions. Build confidence with the shared Foundation-tier content first, since roughly 40% of Higher-tier marks are targeted at the grades 4–5 boundary that both tiers have in common.

Lessons