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Circles, sectors and arcs - OCRParts of a circle

Circles are 2D shapes with one side and no corners. The circumference is always the same distance from the centre - the radius. Sectors, segments, arcs and chords are different parts of a circle.

Part ofMathsGeometry and measure

Parts of a circle

Find the refreshed revision resources for GCSE Maths: Parts of a circle, with step-by-step slideshows, quizzes, practice exam questions, and more!

A chord is a straight line joining two points on the circumference of a circle.

An is a part of the circumference of a circle.

Circle with chord labelled

A segment is an area enclosed by a chord and an arc.

Circle with segment labelled

A sector is an area enclosed by two and an arc.

Circle with sector labelled

A tangent is a straight line which touches the edge of a circle once.

Circle with tangent labelled