Mathematics 0580 · IGCSE · Circle theorems I

Circle theorems I — practice question

Points A, B and C lie on the circumference of a circle, with centre O. The tangent DE meets the circle at C. Angle $BCE = 53^{\circ}$ and angle $ACO = 20^{\circ}$.
(main)[3]

Determine the value of $x$.

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This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Apply the angle-sum rule and linear-pair relationships” …

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