Question

In a circle of radius $21$ cm, an arc subtends an angle of ${60}^0$ at the centre. Find the length of the arc.

Answer 1

$Radius=r=21cm$ and $\theta ={60}^0$

Length of the arc $=\frac{\theta }{360}\left(2\pi r\right)$ $=\frac{60}{360}\times 2\times \frac{22}{7}\times 21$$=22cm$