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Work out the area of the major sector $OCD$. Give your answer in terms of $\pi$.
Mathematics 4024 · O Level · Circles, arcs and sectors
Circles, arcs and sectors — practice question
$OAB$ forms a minor sector of a circle, with centre $O$. $OCD$ forms a major sector of another circle, with centre $O$. $OCA$ and $ODB$ are straight lines. $OC=6\text{ cm}$ and $OA=9\text{ cm}$. The minor arc $AB$ measures $5\pi\text{ cm}$.