A,B,C A, B, C\,A,B,C and D D\,D are points on the circumference of a circle, centre OOO.
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Prove that angle ABC ABC\,ABC and angle ADC ADC\,ADC add to 180∘180^\circ180∘
19 exam-style questions on AQA GCSE Maths Proof of the Circle Theorems. Each one has a worked solution and a mark scheme showing where the marks go.