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Determine the obtuse angle $AOC$.
Mathematics 0580 · IGCSE · Circle theorems I
Circle theorems I — practice question
Points A, B and C lie on a circle with centre O. The angle at B between BA and BC is $130^{\circ}$. The diagram is labelled NOT TO SCALE.
Worked solution & mark scheme
This 2-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Reflex angle $= 2 \times 130$ OR the angle opposite in the cyclic quadrilateral shown $= 50$” …
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