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Circle parts and key formulas

Circle parts and key formulas

Labelled circle showing centre, radius, diameter, circumference, tangent, arc, and sector

Circles have special parts that appear in questions and diagrams. The centre is the middle point, a radius goes from the centre to the edge, and a diameter goes all the way across through the centre.

Area and Circumference of Circles Lesson

  1. GCSE
  2. /Maths
  3. /Area and Circumference of Circles

Step-by-step lessons covering Edexcel GCSE Maths Area and Circumference of Circles for Foundation and Higher tier. Each lesson works through exam-style questions in Paper 1, Paper 2 and Paper 3 format. Build fluency with number, ratio and algebra first, since geometry, probability and statistics topics rely on them, and leave extra time nearer the exam for Higher-tier problem-solving and multi-step reasoning questions.

Lessons

Error IntervalsEstimatingWriting and Simplifying RatioRatioProportionPercentagesPercentage ChangeExchange RatesConversions and UnitsScale DrawingsBest Buy QuestionsSubstitutionSolving EquationsDrawing Linear GraphsArea and Circumference of CirclesTransformationsArea of Compound ShapesFrequency TreesTwo Way Tables