A curved garden border is an arc of a circle of radius 35 m, and the arc makes an angle of 72° at the centre. How long is the border? Take $\pi = \frac{22}{7}$.

Explanation

1. 01

   Arc length = $\frac{\theta}{360^\circ} \times 2\pi r$.

2. 02

   = $\frac{72}{360} \times 2 \times \frac{22}{7} \times 35 = \frac{1}{5} \times 220 = 44$ m.