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Find the size of angle $ACB$. State a reason for each part of your working.
Mathematics 0580 · IGCSE · Circle theorems I
Circle theorems I — practice question
In the diagram, $A$, $B$ and $C$ are points on the circle’s circumference, with centre $O$. The diagram is shown NOT TO SCALE. The angle at $B$ between $OB$ and $AB$ is labelled $28^\circ$.
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “$62^{\circ}$ for $\angle ACB$, together with two correct supporting reasons” …
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