Question

Find the area of sector of circle of radius 21 cm and central angle 120⁰.

Answer 1

Area of a sector of a circle = $\frac{\theta }{360}\times {\mathrm{\pi r}}^2$
$$\begin{gathered} =\frac{120}{360}\times \pi {\left(21\right)}^2 \\ =462{\mathrm{cm}}^2 \end{gathered}$$