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Sector Areas and Arc Lengths
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Parts of a sector

Parts of a sector

Labelled sector with centre O, two radii marked r, central angle theta, arc length L and shaded sector area A

A sector is a slice of a circle made by two radii and an arc. If the angle at the centre is θ\thetaθ, then the sector is the fraction θ360\frac{\theta}{360}360θ​ of the whole circle.

Sector Areas and Arc Lengths Lesson

  1. IGCSE
  2. /Maths
  3. /Sector Areas and Arc Lengths

Step-by-step lessons on Edexcel IGCSE Maths Sector Areas and Arc Lengths. 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.

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