Question

the angle of a sector is 60° and its radius is 21 CM then the length of its arc is

Answer 1

$length \: of \: arc = \frac{ \alpha }{360} \times 2\pi r \\ length \: of \: arc = \frac{60}{360} \times 2\pi \times 21 \\ length \: of \: arc = 21.99115cm$