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Question 1
4 marksA,B A, B\,A,B and C C\,C are points on the circumference of a circle, centre OOO.
All radii of the same circle are [ ], so a triangle made from two radii is [ ].
Revision notes for AQA GCSE Maths Proof of the Circle Theorems. Open the guide for explanations and worked examples. Written against the AQA GCSE Maths (8300) specification, so the content matches what's examinable rather than general Maths background.
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In a proof that the angle at the centre is twice the angle at the circumference, two angles at the centre are 180∘−2x180^\circ-2x180∘−2x and 180∘−2y180^\circ-2y180∘−2y. What is the remaining angle around the centre?