Mathematics 0580 · IGCSE · Circle theorems I

Circle theorems I — practice question

(a)[5]

Calculate the angle ACD.

(b)[2]

On the diagram, mark the centre of the circle with a cross. Explain how you work it out.

(c)[7]

Calculate how much larger the greatest angle in triangle PQR is than the greatest angle in triangle LMN.

Worked solution & mark scheme

This 14-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Applies tan[∠ACD] = 83.2 / (83.2 / tan38 + 54.5)” …

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