Which of the following correctly gives the relation between arc length

MATHEMATICS · Single correct · A Level · Mathematics · Trigonometry · Trigonometry

Problem

s

, radius

r

and angular displacement

\theta

(in radians) for a particle moving in a circle? (a)

s = \dfrac{r}{\theta}

(b)

s = 2\pi r\,\theta

(c)

s = r\,\theta

(d)

s = r\,\theta^{2}