Mathematics 0580 · IGCSE · Circles, arcs and sectors

Circles, arcs and sectors — practice question

The diagram illustrates a sector of a circle with radius $r$ cm and sector angle $72^\circ$. The arc length is 9.35 cm. Diagram is not drawn to scale.
(main)[2]

Calculate $r$.

Worked solution & mark scheme

This 2-mark question has a full step-by-step worked solution and mark scheme. One marking point: “$2\times\pi\times r\times\left(\dfrac{72}{360}\right)$” …

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