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GCSE Mathematics · key term
A line segment through the centre of a circle with both endpoints on the circumference; its length is twice the radius.
Used by AQA, Edexcel and OCR
Specification G9, G17 · Paper 1, Paper 2, Paper 3
A chord that passes through the centre of a circle, or its length.
Revise: Circle ComponentsWhen a chord does pass through the centre, it is a diameter.
Specification G9, G17 · Paper 1, Paper 2, Paper 3
A chord that passes through the centre of a circle; its length is twice the radius.
Revise: Circle PropertiesA diameter goes from one point on the circumference to another through the centre.
A line segment through the centre of a circle with both endpoints on the circumference; it is twice the radius.
Specification 6.02d, 8.05a, 8.05c, 8.05f, 10.02b · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)
A line segment through the centre of a circle whose endpoints lie on the circumference; it is twice the radius.
A chord that passes through the centre of a circle; its length is twice the radius.
A straight line segment joining two points on a circle and passing through its centre.
A line segment through the centre joining two points on a circle.
The distance across a circle through its centre; it is twice the radius.
Check whether a question asks for a radius or a diameter: the diameter is twice the radius.
A chord joins two points on the circumference; it is a diameter only if it passes through the centre.
Write down the formula before substituting values, and check whether the given length is a radius or a diameter.
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