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GCSE Mathematics · key term
An angle whose vertex lies on the circumference and whose arms meet the circumference at two other points.
Used by OCR
Specification 8.05b, 8.05h · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)
An angle with its vertex on a circle and its sides meeting the circle at two other points.
Use the central angle in the sector opposite the angle at the circumference. This may be the reflex angle at the centre, not the smaller angle shown.
Do not merely write “circle theorem”. State the result used: “the angle at the centre is twice the angle at the circumference, subtended by the same arc”.
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