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Calculate the area of the right-angled triangle $AOB$.
Mathematics 0580 · IGCSE · Circles, arcs and sectors
Circles, arcs and sectors — practice question
Points $A$ and $B$ are located on a circle with centre $O$ and radius $r$. The diagram depicts triangle $AOB$ with a right angle at $O$. Since both $OA$ and $OB$ are radii of the circle, the circle has area $120\text{ cm}^2$.